diff --git a/composer.json b/composer.json
index 157acb4..c81a672 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
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-        ]
+        "test:coverage": "XDEBUG_MODE=coverage composer exec \"@test --configuration=phpunit.ci.xml --coverage-text --testsuite unit\""
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diff --git a/composer.lock b/composer.lock
index e3b363c..9329382 100644
--- a/composer.lock
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@@ -803,16 +803,16 @@
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@@ -1437,16 +1437,16 @@
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@@ -1561,7 +1561,7 @@
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-            "version": "v6.2.5",
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@@ -4341,7 +4342,7 @@
                 "serialize"
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+                "source": "https://github.com/symfony/var-exporter/tree/v6.2.7"
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+            "time": "2023-02-24T10:42:00+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v6.2.5",
+            "version": "v6.2.7",
             "source": {
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                 "url": "https://github.com/symfony/yaml.git",
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             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/yaml/tree/v6.2.5"
+                "source": "https://github.com/symfony/yaml/tree/v6.2.7"
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+            "time": "2023-02-16T09:57:23+00:00"
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diff --git a/docs/classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html b/docs/classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html
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index 0000000..d6d56e9
--- /dev/null
+++ b/docs/classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html
@@ -0,0 +1,235 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+            <title>Documentation</title>
+
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+</h4>
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+                    <li>
+                <a href="namespaces/phpolar-csvfilestorage.html" class="">CsvFileStorage</a>
+
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+
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+        <h3 class="phpdocumentor-sidebar__root-package"><a href="indices/files.html">Files</a></h3>
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+    </ul>
+
+    <article class="phpdocumentor-element -class">
+        <h2 class="phpdocumentor-content__title">
+    AmbiguousUnionTypeException
+
+        <span class="phpdocumentor-element__extends">
+        extends <abbr title="\RuntimeException">RuntimeException</abbr>
+    </span>
+
+            <div class="phpdocumentor-element__package">
+            in package
+            <ul class="phpdocumentor-breadcrumbs">
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+
+
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+
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+    <abbr class="phpdocumentor-element-found-in__file" title="AmbiguousUnionTypeException.php"><a href="files/ambiguousuniontypeexception.html"><abbr title="AmbiguousUnionTypeException.php">AmbiguousUnionTypeException.php</abbr></a></abbr>
+    :
+    <span class="phpdocumentor-element-found-in__line">12</span>
+
+    </aside>
+
+            <p class="phpdocumentor-summary">Represents when the type cannot be confidently selected from the specified union type</p>
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+                            code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
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+                        else {
+                            code.textContent = '✖ Error: File does not exist, is empty or trying to view from localhost';
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+
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+        cssVars({});
+    </script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/prism.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/autoloader/prism-autoloader.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.min.js"></script>
+</body>
+</html>
diff --git a/docs/classes/Phpolar-CsvFileStorage-CsvFileStorage.html b/docs/classes/Phpolar-CsvFileStorage-CsvFileStorage.html
index ce01208..98859f6 100644
--- a/docs/classes/Phpolar-CsvFileStorage-CsvFileStorage.html
+++ b/docs/classes/Phpolar-CsvFileStorage-CsvFileStorage.html
@@ -116,13 +116,16 @@ <h2 class="phpdocumentor-content__title">
                             </ul>
         </div>
 
+            <span class="phpdocumentor-element__implements">
+            implements
+                            <abbr title="\Countable">Countable</abbr>                    </span>
 
     </h2>
 
         <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="CsvFileStorage.php"><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">16</span>
+    <span class="phpdocumentor-element-found-in__line">21</span>
 
     </aside>
 
@@ -134,6 +137,18 @@ <h2 class="phpdocumentor-content__title">
 
 
 
+<h3 id="interfaces_class_traits">
+    Interfaces, Classes, Traits and Enums
+    <a href="#interfaces_class_traits" class="headerlink"><i class="fas fa-link"></i></a>
+</h3>
+
+<dl class="phpdocumentor-table-of-contents">
+            <dt class="phpdocumentor-table-of-contents__entry -interface"><abbr title="\Countable">Countable</abbr></dt>
+        <dd></dd>
+
+
+
+    </dl>
 
 
 <h3 id="toc">
@@ -164,11 +179,11 @@ <h3 id="toc">
 <dd></dd>
 
             <dt class="phpdocumentor-table-of-contents__entry -method -public">
-    <a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_load">load()</a>
+    <a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_count">count()</a>
     <span>
-                                &nbsp;: void    </span>
+                                &nbsp;: int    </span>
 </dt>
-<dd></dd>
+<dd>Get the count of items in storage</dd>
 
         </dl>
 
@@ -196,14 +211,14 @@ <h4 class="phpdocumentor-element__name" id="method___construct">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="CsvFileStorage.php"><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">29</span>
+    <span class="phpdocumentor-element-found-in__line">52</span>
 
     </aside>
 
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">public</span>
-                    <span class="phpdocumentor-signature__name">__construct</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$filename</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">mixed</span></code>
+                    <span class="phpdocumentor-signature__name">__construct</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$filename</span></span><span class="phpdocumentor-signature__argument"><span>[</span><span>, </span><span class="phpdocumentor-signature__argument__return-type">string|null&nbsp;</span><span class="phpdocumentor-signature__argument__name">$typeClassName</span><span> = </span><span class="phpdocumentor-signature__argument__default-value">null</span><span> ]</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">mixed</span></code>
 
         <section class="phpdocumentor-description"></section>
 
@@ -216,6 +231,14 @@ <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
             <dd class="phpdocumentor-argument-list__definition">
                     <section class="phpdocumentor-description"></section>
 
+            </dd>
+                    <dt class="phpdocumentor-argument-list__entry">
+                <span class="phpdocumentor-signature__argument__name">$typeClassName</span>
+                : <span class="phpdocumentor-signature__argument__return-type">string|null</span>
+                 = <span class="phpdocumentor-signature__argument__default-value">null</span>            </dt>
+            <dd class="phpdocumentor-argument-list__definition">
+                    <section class="phpdocumentor-description"></section>
+
             </dd>
             </dl>
 
@@ -240,7 +263,7 @@ <h4 class="phpdocumentor-element__name" id="method___destruct">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="CsvFileStorage.php"><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">38</span>
+    <span class="phpdocumentor-element-found-in__line">74</span>
 
     </aside>
 
@@ -273,7 +296,7 @@ <h4 class="phpdocumentor-element__name" id="method_commit">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="CsvFileStorage.php"><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">43</span>
+    <span class="phpdocumentor-element-found-in__line">85</span>
 
     </aside>
 
@@ -299,29 +322,29 @@ <h5 class="phpdocumentor-return-value__heading">Return values</h5>
             -public
                                                         "
 >
-    <h4 class="phpdocumentor-element__name" id="method_load">
-        load()
-        <a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_load" class="headerlink"><i class="fas fa-link"></i></a>
+    <h4 class="phpdocumentor-element__name" id="method_count">
+        count()
+        <a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_count" class="headerlink"><i class="fas fa-link"></i></a>
     </h4>
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="CsvFileStorage.php"><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">76</span>
+    <span class="phpdocumentor-element-found-in__line">124</span>
 
     </aside>
 
+        <p class="phpdocumentor-summary">Get the count of items in storage</p>
 
     <code class="phpdocumentor-code phpdocumentor-signature ">
     <span class="phpdocumentor-signature__visibility">public</span>
-                    <span class="phpdocumentor-signature__name">load</span><span>(</span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">void</span></code>
+                    <span class="phpdocumentor-signature__name">count</span><span>(</span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">int</span></code>
 
-        <section class="phpdocumentor-description"></section>
 
 
 
 
         <h5 class="phpdocumentor-return-value__heading">Return values</h5>
-    <span class="phpdocumentor-signature__response_type">void</span>
+    <span class="phpdocumentor-signature__response_type">int</span>
             &mdash;
 
 
diff --git a/docs/classes/Phpolar-CsvFileStorage-FileNotExistsException.html b/docs/classes/Phpolar-CsvFileStorage-FileNotExistsException.html
new file mode 100644
index 0000000..9855d5a
--- /dev/null
+++ b/docs/classes/Phpolar-CsvFileStorage-FileNotExistsException.html
@@ -0,0 +1,299 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+            <title>Documentation</title>
+
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <base href="../">
+    <link rel="icon" href="images/favicon.ico"/>
+    <link rel="stylesheet" href="css/normalize.css">
+    <link rel="stylesheet" href="css/base.css">
+            <link rel="preconnect" href="https://fonts.gstatic.com">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link rel="stylesheet" href="css/template.css">
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0/css/all.min.css" integrity="sha256-ybRkN9dBjhcS2qrW1z+hfCxq+1aBdwyQM5wlQoQVt/0=" crossorigin="anonymous" />
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/themes/prism-okaidia.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.css">
+                <script src="https://cdn.jsdelivr.net/npm/fuse.js@3.4.6"></script>
+        <script src="https://cdn.jsdelivr.net/npm/css-vars-ponyfill@2"></script>
+        <script src="js/search.js"></script>
+        <script defer src="js/searchIndex.js"></script>
+    </head>
+<body id="top">
+    <header class="phpdocumentor-header phpdocumentor-section">
+    <h1 class="phpdocumentor-title"><a href="" class="phpdocumentor-title__link">Documentation</a></h1>
+    <input class="phpdocumentor-header__menu-button" type="checkbox" id="menu-button" name="menu-button" />
+    <label class="phpdocumentor-header__menu-icon" for="menu-button">
+        <i class="fas fa-bars"></i>
+    </label>
+    <section data-search-form class="phpdocumentor-search">
+    <label>
+        <span class="visually-hidden">Search for</span>
+        <svg class="phpdocumentor-search__icon" width="21" height="20" viewBox="0 0 21 20" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <circle cx="7.5" cy="7.5" r="6.5" stroke="currentColor" stroke-width="2"/>
+            <line x1="12.4892" y1="12.2727" x2="19.1559" y2="18.9393" stroke="currentColor" stroke-width="3"/>
+        </svg>
+        <input type="search" class="phpdocumentor-field phpdocumentor-search__field" placeholder="Loading .." disabled />
+    </label>
+</section>
+
+    <nav class="phpdocumentor-topnav">
+    <ul class="phpdocumentor-topnav__menu">
+        </ul>
+</nav>
+</header>
+
+    <main class="phpdocumentor">
+        <div class="phpdocumentor-section">
+            <input class="phpdocumentor-sidebar__menu-button" type="checkbox" id="sidebar-button" name="sidebar-button" />
+<label class="phpdocumentor-sidebar__menu-icon" for="sidebar-button">
+    Menu
+</label>
+<aside class="phpdocumentor-column -four phpdocumentor-sidebar">
+                    <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Namespaces</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="namespaces/phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="namespaces/phpolar-csvfilestorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+                <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Packages</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="packages/Phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="packages/Phpolar-CsvFileStorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Reports</h2>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="graphs/classes.html">Class Diagram</a></h3>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/deprecated.html">Deprecated</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/errors.html">Errors</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/markers.html">Markers</a></h3>
+    </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Indices</h2>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="indices/files.html">Files</a></h3>
+    </section>
+</aside>
+
+            <div class="phpdocumentor-column -eight phpdocumentor-content">
+                    <ul class="phpdocumentor-breadcrumbs">
+            <li class="phpdocumentor-breadcrumb"><a href="namespaces/phpolar.html">Phpolar</a></li>
+            <li class="phpdocumentor-breadcrumb"><a href="namespaces/phpolar-csvfilestorage.html">CsvFileStorage</a></li>
+    </ul>
+
+    <article class="phpdocumentor-element -class">
+        <h2 class="phpdocumentor-content__title">
+    FileNotExistsException
+
+        <span class="phpdocumentor-element__extends">
+        extends <abbr title="\RuntimeException">RuntimeException</abbr>
+    </span>
+
+            <div class="phpdocumentor-element__package">
+            in package
+            <ul class="phpdocumentor-breadcrumbs">
+                                    <li class="phpdocumentor-breadcrumb"><a href="packages/Phpolar.html">Phpolar</a></li>
+                                    <li class="phpdocumentor-breadcrumb"><a href="packages/Phpolar-CsvFileStorage.html">CsvFileStorage</a></li>
+                            </ul>
+        </div>
+
+
+    </h2>
+
+        <aside class="phpdocumentor-element-found-in">
+    <abbr class="phpdocumentor-element-found-in__file" title="FileNotExistsException.php"><a href="files/filenotexistsexception.html"><abbr title="FileNotExistsException.php">FileNotExistsException.php</abbr></a></abbr>
+    :
+    <span class="phpdocumentor-element-found-in__line">12</span>
+
+    </aside>
+
+            <p class="phpdocumentor-summary">Represents when a file should exist but does not.</p>
+
+
+
+
+
+
+
+
+
+<h3 id="toc">
+    Table of Contents
+    <a href="#toc" class="headerlink"><i class="fas fa-link"></i></a>
+</h3>
+
+<dl class="phpdocumentor-table-of-contents">
+                        <dt class="phpdocumentor-table-of-contents__entry -method -public">
+    <a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html#method___construct">__construct()</a>
+    <span>
+                                &nbsp;: mixed    </span>
+</dt>
+<dd></dd>
+
+        </dl>
+
+
+
+
+
+
+
+            <section class="phpdocumentor-methods">
+        <h3 class="phpdocumentor-elements__header" id="methods">
+            Methods
+            <a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html#methods" class="headerlink"><i class="fas fa-link"></i></a>
+        </h3>
+                    <article
+        class="phpdocumentor-element
+            -method
+            -public
+                                                        "
+>
+    <h4 class="phpdocumentor-element__name" id="method___construct">
+        __construct()
+        <a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html#method___construct" class="headerlink"><i class="fas fa-link"></i></a>
+    </h4>
+    <aside class="phpdocumentor-element-found-in">
+    <abbr class="phpdocumentor-element-found-in__file" title="FileNotExistsException.php"><a href="files/filenotexistsexception.html"><abbr title="FileNotExistsException.php">FileNotExistsException.php</abbr></a></abbr>
+    :
+    <span class="phpdocumentor-element-found-in__line">14</span>
+
+    </aside>
+
+
+    <code class="phpdocumentor-code phpdocumentor-signature ">
+    <span class="phpdocumentor-signature__visibility">public</span>
+                    <span class="phpdocumentor-signature__name">__construct</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$filename</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature__response_type">mixed</span></code>
+
+        <section class="phpdocumentor-description"></section>
+
+        <h5 class="phpdocumentor-argument-list__heading">Parameters</h5>
+    <dl class="phpdocumentor-argument-list">
+                    <dt class="phpdocumentor-argument-list__entry">
+                <span class="phpdocumentor-signature__argument__name">$filename</span>
+                : <span class="phpdocumentor-signature__argument__return-type">string</span>
+                            </dt>
+            <dd class="phpdocumentor-argument-list__definition">
+                    <section class="phpdocumentor-description"></section>
+
+            </dd>
+            </dl>
+
+
+
+        <h5 class="phpdocumentor-return-value__heading">Return values</h5>
+    <span class="phpdocumentor-signature__response_type">mixed</span>
+            &mdash;
+
+
+</article>
+            </section>
+
+
+    <script type="text/javascript">
+        function loadExternalCodeSnippets(line) {
+            Array.prototype.slice.call(document.querySelectorAll('pre[data-src]')).forEach((pre) => {
+                var src = pre.getAttribute('data-src').replace( /\\/g, '/');
+                var extension = (src.match(/\.(\w+)$/) || [, ''])[1];
+                var language = 'php';
+
+                var code = document.createElement('code');
+                code.className = 'language-' + language;
+
+                pre.textContent = '';
+
+                pre.setAttribute('data-line', line)
+                code.textContent = 'Loading…';
+
+                pre.appendChild(code);
+
+                var xhr = new XMLHttpRequest();
+
+                xhr.open('GET', src, true);
+
+                xhr.onreadystatechange = function () {
+                    if (xhr.readyState == 4) {
+
+                        if (xhr.status < 400 && xhr.responseText) {
+                            code.textContent = xhr.responseText;
+
+                            Prism.highlightElement(code);
+                        }
+                        else if (xhr.status >= 400) {
+                            code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
+                        }
+                        else {
+                            code.textContent = '✖ Error: File does not exist, is empty or trying to view from localhost';
+                        }
+                    }
+                };
+
+                xhr.send(null);
+            });
+        }
+
+        var modals = document.querySelectorAll("[data-modal]");
+
+        modals.forEach(function (trigger) {
+            trigger.addEventListener("click", function (event) {
+                //event.preventDefault();
+                const modal = document.getElementById(trigger.dataset.modal);
+                modal.classList.add("phpdocumentor-modal__open");
+                loadExternalCodeSnippets(trigger.dataset.line)
+                const exits = modal.querySelectorAll("[data-exit-button]");
+                exits.forEach(function (exit) {
+                    exit.addEventListener("click", function (event) {
+                        event.preventDefault();
+                        modal.classList.remove("phpdocumentor-modal__open");
+                    });
+                });
+            });
+        });
+    </script>
+
+    </article>
+                <section data-search-results class="phpdocumentor-search-results phpdocumentor-search-results--hidden">
+    <section class="phpdocumentor-search-results__dialog">
+        <header class="phpdocumentor-search-results__header">
+            <h2 class="phpdocumentor-search-results__title">Search results</h2>
+            <button class="phpdocumentor-search-results__close"><i class="fas fa-times"></i></button>
+        </header>
+        <section class="phpdocumentor-search-results__body">
+            <ul class="phpdocumentor-search-results__entries"></ul>
+        </section>
+    </section>
+</section>
+            </div>
+        </div>
+        <a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html#top" class="phpdocumentor-back-to-top"><i class="fas fa-chevron-circle-up"></i></a>
+
+    </main>
+
+    <script>
+        cssVars({});
+    </script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/prism.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/autoloader/prism-autoloader.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.min.js"></script>
+</body>
+</html>
diff --git a/docs/files/ambiguousuniontypeexception.html b/docs/files/ambiguousuniontypeexception.html
new file mode 100644
index 0000000..55bc085
--- /dev/null
+++ b/docs/files/ambiguousuniontypeexception.html
@@ -0,0 +1,158 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+            <title>Documentation</title>
+
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <base href="../">
+    <link rel="icon" href="images/favicon.ico"/>
+    <link rel="stylesheet" href="css/normalize.css">
+    <link rel="stylesheet" href="css/base.css">
+            <link rel="preconnect" href="https://fonts.gstatic.com">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link rel="stylesheet" href="css/template.css">
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0/css/all.min.css" integrity="sha256-ybRkN9dBjhcS2qrW1z+hfCxq+1aBdwyQM5wlQoQVt/0=" crossorigin="anonymous" />
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/themes/prism-okaidia.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.css">
+                <script src="https://cdn.jsdelivr.net/npm/fuse.js@3.4.6"></script>
+        <script src="https://cdn.jsdelivr.net/npm/css-vars-ponyfill@2"></script>
+        <script src="js/search.js"></script>
+        <script defer src="js/searchIndex.js"></script>
+    </head>
+<body id="top">
+    <header class="phpdocumentor-header phpdocumentor-section">
+    <h1 class="phpdocumentor-title"><a href="" class="phpdocumentor-title__link">Documentation</a></h1>
+    <input class="phpdocumentor-header__menu-button" type="checkbox" id="menu-button" name="menu-button" />
+    <label class="phpdocumentor-header__menu-icon" for="menu-button">
+        <i class="fas fa-bars"></i>
+    </label>
+    <section data-search-form class="phpdocumentor-search">
+    <label>
+        <span class="visually-hidden">Search for</span>
+        <svg class="phpdocumentor-search__icon" width="21" height="20" viewBox="0 0 21 20" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <circle cx="7.5" cy="7.5" r="6.5" stroke="currentColor" stroke-width="2"/>
+            <line x1="12.4892" y1="12.2727" x2="19.1559" y2="18.9393" stroke="currentColor" stroke-width="3"/>
+        </svg>
+        <input type="search" class="phpdocumentor-field phpdocumentor-search__field" placeholder="Loading .." disabled />
+    </label>
+</section>
+
+    <nav class="phpdocumentor-topnav">
+    <ul class="phpdocumentor-topnav__menu">
+        </ul>
+</nav>
+</header>
+
+    <main class="phpdocumentor">
+        <div class="phpdocumentor-section">
+            <input class="phpdocumentor-sidebar__menu-button" type="checkbox" id="sidebar-button" name="sidebar-button" />
+<label class="phpdocumentor-sidebar__menu-icon" for="sidebar-button">
+    Menu
+</label>
+<aside class="phpdocumentor-column -four phpdocumentor-sidebar">
+                    <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Namespaces</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="namespaces/phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="namespaces/phpolar-csvfilestorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+                <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Packages</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="packages/Phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="packages/Phpolar-CsvFileStorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Reports</h2>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="graphs/classes.html">Class Diagram</a></h3>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/deprecated.html">Deprecated</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/errors.html">Errors</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/markers.html">Markers</a></h3>
+    </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Indices</h2>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="indices/files.html">Files</a></h3>
+    </section>
+</aside>
+
+            <div class="phpdocumentor-column -eight phpdocumentor-content">
+                    <ul class="phpdocumentor-breadcrumbs">
+    </ul>
+
+    <article class="phpdocumentor-element -file">
+        <h2 class="phpdocumentor-content__title">AmbiguousUnionTypeException.php</h2>
+
+
+    <section class="phpdocumentor-description"></section>
+
+
+
+
+
+
+<h3 id="interfaces_class_traits">
+    Interfaces, Classes, Traits and Enums
+    <a href="#interfaces_class_traits" class="headerlink"><i class="fas fa-link"></i></a>
+</h3>
+
+<dl class="phpdocumentor-table-of-contents">
+
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html"><abbr title="\Phpolar\CsvFileStorage\AmbiguousUnionTypeException">AmbiguousUnionTypeException</abbr></a></dt>
+        <dd>Represents when the type cannot be confidently selected from the specified union type</dd>
+
+
+    </dl>
+
+
+
+
+
+
+
+
+    </article>
+                <section data-search-results class="phpdocumentor-search-results phpdocumentor-search-results--hidden">
+    <section class="phpdocumentor-search-results__dialog">
+        <header class="phpdocumentor-search-results__header">
+            <h2 class="phpdocumentor-search-results__title">Search results</h2>
+            <button class="phpdocumentor-search-results__close"><i class="fas fa-times"></i></button>
+        </header>
+        <section class="phpdocumentor-search-results__body">
+            <ul class="phpdocumentor-search-results__entries"></ul>
+        </section>
+    </section>
+</section>
+            </div>
+        </div>
+        <a href="files/ambiguousuniontypeexception.html#top" class="phpdocumentor-back-to-top"><i class="fas fa-chevron-circle-up"></i></a>
+
+    </main>
+
+    <script>
+        cssVars({});
+    </script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/prism.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/autoloader/prism-autoloader.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.min.js"></script>
+</body>
+</html>
diff --git a/docs/files/filenotexistsexception.html b/docs/files/filenotexistsexception.html
new file mode 100644
index 0000000..67c0e7d
--- /dev/null
+++ b/docs/files/filenotexistsexception.html
@@ -0,0 +1,158 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+            <title>Documentation</title>
+
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <base href="../">
+    <link rel="icon" href="images/favicon.ico"/>
+    <link rel="stylesheet" href="css/normalize.css">
+    <link rel="stylesheet" href="css/base.css">
+            <link rel="preconnect" href="https://fonts.gstatic.com">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link href="https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@400;600;700&display=swap" rel="stylesheet">
+        <link rel="stylesheet" href="css/template.css">
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0/css/all.min.css" integrity="sha256-ybRkN9dBjhcS2qrW1z+hfCxq+1aBdwyQM5wlQoQVt/0=" crossorigin="anonymous" />
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/themes/prism-okaidia.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.css">
+                <script src="https://cdn.jsdelivr.net/npm/fuse.js@3.4.6"></script>
+        <script src="https://cdn.jsdelivr.net/npm/css-vars-ponyfill@2"></script>
+        <script src="js/search.js"></script>
+        <script defer src="js/searchIndex.js"></script>
+    </head>
+<body id="top">
+    <header class="phpdocumentor-header phpdocumentor-section">
+    <h1 class="phpdocumentor-title"><a href="" class="phpdocumentor-title__link">Documentation</a></h1>
+    <input class="phpdocumentor-header__menu-button" type="checkbox" id="menu-button" name="menu-button" />
+    <label class="phpdocumentor-header__menu-icon" for="menu-button">
+        <i class="fas fa-bars"></i>
+    </label>
+    <section data-search-form class="phpdocumentor-search">
+    <label>
+        <span class="visually-hidden">Search for</span>
+        <svg class="phpdocumentor-search__icon" width="21" height="20" viewBox="0 0 21 20" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <circle cx="7.5" cy="7.5" r="6.5" stroke="currentColor" stroke-width="2"/>
+            <line x1="12.4892" y1="12.2727" x2="19.1559" y2="18.9393" stroke="currentColor" stroke-width="3"/>
+        </svg>
+        <input type="search" class="phpdocumentor-field phpdocumentor-search__field" placeholder="Loading .." disabled />
+    </label>
+</section>
+
+    <nav class="phpdocumentor-topnav">
+    <ul class="phpdocumentor-topnav__menu">
+        </ul>
+</nav>
+</header>
+
+    <main class="phpdocumentor">
+        <div class="phpdocumentor-section">
+            <input class="phpdocumentor-sidebar__menu-button" type="checkbox" id="sidebar-button" name="sidebar-button" />
+<label class="phpdocumentor-sidebar__menu-icon" for="sidebar-button">
+    Menu
+</label>
+<aside class="phpdocumentor-column -four phpdocumentor-sidebar">
+                    <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Namespaces</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="namespaces/phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="namespaces/phpolar-csvfilestorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+                <section class="phpdocumentor-sidebar__category">
+            <h2 class="phpdocumentor-sidebar__category-header">Packages</h2>
+                                    <h4 class="phpdocumentor-sidebar__root-namespace">
+    <a href="packages/Phpolar.html" class="">Phpolar</a>
+</h4>
+    <ul class="phpdocumentor-list">
+                    <li>
+                <a href="packages/Phpolar-CsvFileStorage.html" class="">CsvFileStorage</a>
+
+            </li>
+            </ul>
+
+                        </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Reports</h2>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="graphs/classes.html">Class Diagram</a></h3>
+                <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/deprecated.html">Deprecated</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/errors.html">Errors</a></h3>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="reports/markers.html">Markers</a></h3>
+    </section>
+
+    <section class="phpdocumentor-sidebar__category">
+        <h2 class="phpdocumentor-sidebar__category-header">Indices</h2>
+        <h3 class="phpdocumentor-sidebar__root-package"><a href="indices/files.html">Files</a></h3>
+    </section>
+</aside>
+
+            <div class="phpdocumentor-column -eight phpdocumentor-content">
+                    <ul class="phpdocumentor-breadcrumbs">
+    </ul>
+
+    <article class="phpdocumentor-element -file">
+        <h2 class="phpdocumentor-content__title">FileNotExistsException.php</h2>
+
+
+    <section class="phpdocumentor-description"></section>
+
+
+
+
+
+
+<h3 id="interfaces_class_traits">
+    Interfaces, Classes, Traits and Enums
+    <a href="#interfaces_class_traits" class="headerlink"><i class="fas fa-link"></i></a>
+</h3>
+
+<dl class="phpdocumentor-table-of-contents">
+
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html"><abbr title="\Phpolar\CsvFileStorage\FileNotExistsException">FileNotExistsException</abbr></a></dt>
+        <dd>Represents when a file should exist but does not.</dd>
+
+
+    </dl>
+
+
+
+
+
+
+
+
+    </article>
+                <section data-search-results class="phpdocumentor-search-results phpdocumentor-search-results--hidden">
+    <section class="phpdocumentor-search-results__dialog">
+        <header class="phpdocumentor-search-results__header">
+            <h2 class="phpdocumentor-search-results__title">Search results</h2>
+            <button class="phpdocumentor-search-results__close"><i class="fas fa-times"></i></button>
+        </header>
+        <section class="phpdocumentor-search-results__body">
+            <ul class="phpdocumentor-search-results__entries"></ul>
+        </section>
+    </section>
+</section>
+            </div>
+        </div>
+        <a href="files/filenotexistsexception.html#top" class="phpdocumentor-back-to-top"><i class="fas fa-chevron-circle-up"></i></a>
+
+    </main>
+
+    <script>
+        cssVars({});
+    </script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/prism.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/autoloader/prism-autoloader.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-numbers/prism-line-numbers.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/prismjs@1.23.0/plugins/line-highlight/prism-line-highlight.min.js"></script>
+</body>
+</html>
diff --git a/docs/graphs/classes.svg b/docs/graphs/classes.svg
index fe5854e..ebdf24e 100644
--- a/docs/graphs/classes.svg
+++ b/docs/graphs/classes.svg
@@ -1,9 +1,16 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="119px" preserveAspectRatio="none" style="width:471px;height:119px;" version="1.1" viewBox="0 0 471 119" width="471px" zoomAndPan="magnify"><defs/><g><!--MD5=[403cdfcb274070a3f9729a7ab788ec99]
-cluster Phpolar\\CsvFileStorage--><polygon fill="#FFFFFF" points="250,24,439,24,446,46.2969,449,46.2969,449,107,250,107,250,24" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="250" x2="446" y1="46.2969" y2="46.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="183" x="254" y="38.9951">Phpolar\CsvFileStorage</text><!--MD5=[f075466b5a5628840a44b33ab13d7449]
-cluster Phpolar\\Phpolar\\Storage--><polygon fill="#FFFFFF" points="14,24,212,24,219,46.2969,222,46.2969,222,107,14,107,14,24" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="14" x2="219" y1="46.2969" y2="46.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="192" x="18" y="38.9951">Phpolar\Phpolar\Storage</text><!--MD5=[1ac725021974839d147ffe0f4c9bb3c6]
-class Phpolar\\CsvFileStorage\\CsvFileStorage--><rect fill="#FEFECE" height="32" id="Phpolar\\CsvFileStorage\\CsvFileStorage" style="stroke: #A80036; stroke-width: 1.5;" width="124" x="287" y="59"/><ellipse cx="302" cy="75" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M304.9688,80.6406 Q304.3906,80.9375 303.75,81.0781 Q303.1094,81.2344 302.4063,81.2344 Q299.9063,81.2344 298.5781,79.5938 Q297.2656,77.9375 297.2656,74.8125 Q297.2656,71.6875 298.5781,70.0313 Q299.9063,68.375 302.4063,68.375 Q303.1094,68.375 303.75,68.5313 Q304.4063,68.6875 304.9688,68.9844 L304.9688,71.7031 Q304.3438,71.125 303.75,70.8594 Q303.1563,70.5781 302.5313,70.5781 Q301.1875,70.5781 300.5,71.6563 Q299.8125,72.7188 299.8125,74.8125 Q299.8125,76.9063 300.5,77.9844 Q301.1875,79.0469 302.5313,79.0469 Q303.1563,79.0469 303.75,78.7813 Q304.3438,78.5 304.9688,77.9219 L304.9688,80.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="92" x="316" y="79.1543">CsvFileStorage</text><!--MD5=[8b8e5ab3ddda216173c72732b9c6bf5d]
-class Phpolar\\Phpolar\\Storage\\AbstractStorage--><rect fill="#FEFECE" height="32" id="Phpolar\\Phpolar\\Storage\\AbstractStorage" style="stroke: #A80036; stroke-width: 1.5;" width="135" x="50" y="59"/><ellipse cx="65" cy="75" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M67.9688,80.6406 Q67.3906,80.9375 66.75,81.0781 Q66.1094,81.2344 65.4063,81.2344 Q62.9063,81.2344 61.5781,79.5938 Q60.2656,77.9375 60.2656,74.8125 Q60.2656,71.6875 61.5781,70.0313 Q62.9063,68.375 65.4063,68.375 Q66.1094,68.375 66.75,68.5313 Q67.4063,68.6875 67.9688,68.9844 L67.9688,71.7031 Q67.3438,71.125 66.75,70.8594 Q66.1563,70.5781 65.5313,70.5781 Q64.1875,70.5781 63.5,71.6563 Q62.8125,72.7188 62.8125,74.8125 Q62.8125,76.9063 63.5,77.9844 Q64.1875,79.0469 65.5313,79.0469 Q66.1563,79.0469 66.75,78.7813 Q67.3438,78.5 67.9688,77.9219 L67.9688,80.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="103" x="79" y="79.1543">AbstractStorage</text><!--MD5=[fd6699ad174f6ffed793c38675ccc7d3]
-reverse link Phpolar\\Phpolar\\Storage\\AbstractStorage to Phpolar\\CsvFileStorage\\CsvFileStorage--><path d="M205.08,75 C205.08,75 286.88,75 286.88,75 " fill="none" id="Phpolar\\Phpolar\\Storage\\AbstractStorage&lt;-Phpolar\\CsvFileStorage\\CsvFileStorage" style="stroke: #516F42; stroke-width: 1.0;"/><polygon fill="none" points="205.08,82,185.08,75,205.08,68,205.08,82" style="stroke: #516F42; stroke-width: 1.0;"/><!--MD5=[42e00d04538cb38aee00bf5c79323c07]
+<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="319px" preserveAspectRatio="none" style="width:535px;height:319px;" version="1.1" viewBox="0 0 535 319" width="535px" zoomAndPan="magnify"><defs/><g><!--MD5=[403cdfcb274070a3f9729a7ab788ec99]
+cluster Phpolar\\CsvFileStorage--><polygon fill="#FFFFFF" points="254.5,24,443.5,24,450.5,46.2969,513.5,46.2969,513.5,241,254.5,241,254.5,24" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="254.5" x2="450.5" y1="46.2969" y2="46.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="183" x="258.5" y="38.9951">Phpolar\CsvFileStorage</text><!--MD5=[f075466b5a5628840a44b33ab13d7449]
+cluster Phpolar\\Phpolar\\Storage--><polygon fill="#FFFFFF" points="14,224,212,224,219,246.2969,222,246.2969,222,307,14,307,14,224" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="14" x2="219" y1="246.2969" y2="246.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="192" x="18" y="238.9951">Phpolar\Phpolar\Storage</text><!--MD5=[791fcc5d7b2207b7e12e745ba2733fd7]
+class Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException--><rect fill="#FEFECE" height="32" id="Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException" style="stroke: #A80036; stroke-width: 1.5;" width="227" x="270.5" y="126"/><ellipse cx="285.5" cy="142" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M288.4688,147.6406 Q287.8906,147.9375 287.25,148.0781 Q286.6094,148.2344 285.9063,148.2344 Q283.4063,148.2344 282.0781,146.5938 Q280.7656,144.9375 280.7656,141.8125 Q280.7656,138.6875 282.0781,137.0313 Q283.4063,135.375 285.9063,135.375 Q286.6094,135.375 287.25,135.5313 Q287.9063,135.6875 288.4688,135.9844 L288.4688,138.7031 Q287.8438,138.125 287.25,137.8594 Q286.6563,137.5781 286.0313,137.5781 Q284.6875,137.5781 284,138.6563 Q283.3125,139.7188 283.3125,141.8125 Q283.3125,143.9063 284,144.9844 Q284.6875,146.0469 286.0313,146.0469 Q286.6563,146.0469 287.25,145.7813 Q287.8438,145.5 288.4688,144.9219 L288.4688,147.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="195" x="299.5" y="146.1543">AmbiguousUnionTypeException</text><!--MD5=[1ac725021974839d147ffe0f4c9bb3c6]
+class Phpolar\\CsvFileStorage\\CsvFileStorage--><rect fill="#FEFECE" height="32" id="Phpolar\\CsvFileStorage\\CsvFileStorage" style="stroke: #A80036; stroke-width: 1.5;" width="124" x="322" y="193"/><ellipse cx="337" cy="209" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M339.9688,214.6406 Q339.3906,214.9375 338.75,215.0781 Q338.1094,215.2344 337.4063,215.2344 Q334.9063,215.2344 333.5781,213.5938 Q332.2656,211.9375 332.2656,208.8125 Q332.2656,205.6875 333.5781,204.0313 Q334.9063,202.375 337.4063,202.375 Q338.1094,202.375 338.75,202.5313 Q339.4063,202.6875 339.9688,202.9844 L339.9688,205.7031 Q339.3438,205.125 338.75,204.8594 Q338.1563,204.5781 337.5313,204.5781 Q336.1875,204.5781 335.5,205.6563 Q334.8125,206.7188 334.8125,208.8125 Q334.8125,210.9063 335.5,211.9844 Q336.1875,213.0469 337.5313,213.0469 Q338.1563,213.0469 338.75,212.7813 Q339.3438,212.5 339.9688,211.9219 L339.9688,214.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="92" x="351" y="213.1543">CsvFileStorage</text><!--MD5=[377191b83de624673084ab32711e71c0]
+class Phpolar\\CsvFileStorage\\FileNotExistsException--><rect fill="#FEFECE" height="32" id="Phpolar\\CsvFileStorage\\FileNotExistsException" style="stroke: #A80036; stroke-width: 1.5;" width="172" x="298" y="59"/><ellipse cx="313" cy="75" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M315.9688,80.6406 Q315.3906,80.9375 314.75,81.0781 Q314.1094,81.2344 313.4063,81.2344 Q310.9063,81.2344 309.5781,79.5938 Q308.2656,77.9375 308.2656,74.8125 Q308.2656,71.6875 309.5781,70.0313 Q310.9063,68.375 313.4063,68.375 Q314.1094,68.375 314.75,68.5313 Q315.4063,68.6875 315.9688,68.9844 L315.9688,71.7031 Q315.3438,71.125 314.75,70.8594 Q314.1563,70.5781 313.5313,70.5781 Q312.1875,70.5781 311.5,71.6563 Q310.8125,72.7188 310.8125,74.8125 Q310.8125,76.9063 311.5,77.9844 Q312.1875,79.0469 313.5313,79.0469 Q314.1563,79.0469 314.75,78.7813 Q315.3438,78.5 315.9688,77.9219 L315.9688,80.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="140" x="327" y="79.1543">FileNotExistsException</text><!--MD5=[8b8e5ab3ddda216173c72732b9c6bf5d]
+class Phpolar\\Phpolar\\Storage\\AbstractStorage--><rect fill="#FEFECE" height="32" id="Phpolar\\Phpolar\\Storage\\AbstractStorage" style="stroke: #A80036; stroke-width: 1.5;" width="135" x="50" y="259"/><ellipse cx="65" cy="275" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M67.9688,280.6406 Q67.3906,280.9375 66.75,281.0781 Q66.1094,281.2344 65.4063,281.2344 Q62.9063,281.2344 61.5781,279.5938 Q60.2656,277.9375 60.2656,274.8125 Q60.2656,271.6875 61.5781,270.0313 Q62.9063,268.375 65.4063,268.375 Q66.1094,268.375 66.75,268.5313 Q67.4063,268.6875 67.9688,268.9844 L67.9688,271.7031 Q67.3438,271.125 66.75,270.8594 Q66.1563,270.5781 65.5313,270.5781 Q64.1875,270.5781 63.5,271.6563 Q62.8125,272.7188 62.8125,274.8125 Q62.8125,276.9063 63.5,277.9844 Q64.1875,279.0469 65.5313,279.0469 Q66.1563,279.0469 66.75,278.7813 Q67.3438,278.5 67.9688,277.9219 L67.9688,280.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="103" x="79" y="279.1543">AbstractStorage</text><!--MD5=[5c6c7d52e42032554528404b62c1d271]
+class RuntimeException--><rect fill="#FEFECE" height="32" id="RuntimeException" style="stroke: #A80036; stroke-width: 1.5;" width="144" x="45.5" y="76"/><ellipse cx="60.5" cy="92" fill="#ADD1B2" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M63.4688,97.6406 Q62.8906,97.9375 62.25,98.0781 Q61.6094,98.2344 60.9063,98.2344 Q58.4063,98.2344 57.0781,96.5938 Q55.7656,94.9375 55.7656,91.8125 Q55.7656,88.6875 57.0781,87.0313 Q58.4063,85.375 60.9063,85.375 Q61.6094,85.375 62.25,85.5313 Q62.9063,85.6875 63.4688,85.9844 L63.4688,88.7031 Q62.8438,88.125 62.25,87.8594 Q61.6563,87.5781 61.0313,87.5781 Q59.6875,87.5781 59,88.6563 Q58.3125,89.7188 58.3125,91.8125 Q58.3125,93.9063 59,94.9844 Q59.6875,96.0469 61.0313,96.0469 Q61.6563,96.0469 62.25,95.7813 Q62.8438,95.5 63.4688,94.9219 L63.4688,97.6406 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="112" x="74.5" y="96.1543">RuntimeException</text><!--MD5=[334491fe3395b7e97ffac59bc72f8221]
+class Countable--><rect fill="#FEFECE" height="32" id="Countable" style="stroke: #A80036; stroke-width: 1.5;" width="96" x="69.5" y="176"/><ellipse cx="84.5" cy="192" fill="#B4A7E5" rx="11" ry="11" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M80.4219,187.7656 L80.4219,185.6094 L87.8125,185.6094 L87.8125,187.7656 L85.3438,187.7656 L85.3438,195.8438 L87.8125,195.8438 L87.8125,198 L80.4219,198 L80.4219,195.8438 L82.8906,195.8438 L82.8906,187.7656 L80.4219,187.7656 Z "/><text fill="#000000" font-family="sans-serif" font-size="12" font-style="italic" lengthAdjust="spacingAndGlyphs" textLength="64" x="98.5" y="196.1543">Countable</text><!--MD5=[e38d57657b03c365ccdc2255cd53f395]
+reverse link RuntimeException to Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException--><path d="M209.78,99.5 C209.78,99.5 284.5,99.5 284.5,99.5 C284.5,99.5 284.5,113.7 284.5,125.69 " fill="none" id="RuntimeException&lt;-Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException" style="stroke: #516F42; stroke-width: 1.0;"/><polygon fill="none" points="209.78,106.5,189.78,99.5,209.78,92.5,209.78,106.5" style="stroke: #516F42; stroke-width: 1.0;"/><!--MD5=[fd6699ad174f6ffed793c38675ccc7d3]
+reverse link Phpolar\\Phpolar\\Storage\\AbstractStorage to Phpolar\\CsvFileStorage\\CsvFileStorage--><path d="M175.5,238.7 C175.5,238.7 175.5,216.5 175.5,216.5 C175.5,216.5 260.29,216.5 321.73,216.5 " fill="none" id="Phpolar\\Phpolar\\Storage\\AbstractStorage&lt;-Phpolar\\CsvFileStorage\\CsvFileStorage" style="stroke: #516F42; stroke-width: 1.0;"/><polygon fill="none" points="182.5,238.7,175.5,258.7,168.5,238.7,182.5,238.7" style="stroke: #516F42; stroke-width: 1.0;"/><!--MD5=[ae4d5f02b0af7b1f262bdf0ad46799a2]
+reverse link Countable to Phpolar\\CsvFileStorage\\CsvFileStorage--><path d="M185.76,200.5 C185.76,200.5 321.52,200.5 321.52,200.5 " fill="none" id="Countable&lt;-Phpolar\\CsvFileStorage\\CsvFileStorage" style="stroke: #516F42; stroke-width: 1.0; stroke-dasharray: 7.0,7.0;"/><polygon fill="none" points="185.76,207.5,165.76,200.5,185.76,193.5,185.76,207.5" style="stroke: #516F42; stroke-width: 1.0;"/><!--MD5=[69b3563bca36be52bc3db0c44fb70c6b]
+reverse link RuntimeException to Phpolar\\CsvFileStorage\\FileNotExistsException--><path d="M209.62,83.5 C209.62,83.5 297.6,83.5 297.6,83.5 " fill="none" id="RuntimeException&lt;-Phpolar\\CsvFileStorage\\FileNotExistsException" style="stroke: #516F42; stroke-width: 1.0;"/><polygon fill="none" points="209.62,90.5,189.62,83.5,209.62,76.5,209.62,90.5" style="stroke: #516F42; stroke-width: 1.0;"/><!--MD5=[49601e79d842ee417324829e49a0ceb4]
 @startuml
    skinparam ArrowColor #516f42
    skinparam activityBorderColor #516f42
@@ -19,7 +26,13 @@ left to right direction
 set namespaceSeparator \\
 
 
-class \\Phpolar\\CsvFileStorage\\CsvFileStorage extends \\Phpolar\\Phpolar\\Storage\\AbstractStorage {
+class \\Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException extends \\RuntimeException {
+}
+
+class \\Phpolar\\CsvFileStorage\\CsvFileStorage extends \\Phpolar\\Phpolar\\Storage\\AbstractStorage implements \\Countable {
+}
+
+class \\Phpolar\\CsvFileStorage\\FileNotExistsException extends \\RuntimeException {
 }
 
 @enduml
@@ -28,7 +41,7 @@ PlantUML version 1.2020.02(Sun Mar 01 04:22:07 CST 2020)
 (GPL source distribution)
 Java Runtime: OpenJDK Runtime Environment
 JVM: OpenJDK 64-Bit Server VM
-Java Version: 11.0.17+8-post-Ubuntu-1ubuntu222.04
+Java Version: 11.0.18+10-post-Ubuntu-0ubuntu122.04
 Operating System: Linux
 Default Encoding: UTF-8
 Language: en
diff --git a/docs/indices/files.html b/docs/indices/files.html
index ec2ca72..b6ccb19 100644
--- a/docs/indices/files.html
+++ b/docs/indices/files.html
@@ -97,11 +97,19 @@ <h3 class="phpdocumentor-sidebar__root-package"><a href="indices/files.html">Fil
             <div class="phpdocumentor-column -eight phpdocumentor-content">
 
     <h2 class="phpdocumentor-content__title">Files</h2>
-                                                                    <h3>C</h3>
+                            <h3>A</h3>
+        <ul class="phpdocumentor-list">
+                    <li><a href="files/ambiguousuniontypeexception.html"><abbr title="AmbiguousUnionTypeException.php">AmbiguousUnionTypeException.php</abbr></a></li>
+                </ul>
+                                                        <h3>C</h3>
         <ul class="phpdocumentor-list">
                     <li><a href="files/csvfilestorage.html"><abbr title="CsvFileStorage.php">CsvFileStorage.php</abbr></a></li>
                 </ul>
-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <section data-search-results class="phpdocumentor-search-results phpdocumentor-search-results--hidden">
+                                                                            <h3>F</h3>
+        <ul class="phpdocumentor-list">
+                    <li><a href="files/filenotexistsexception.html"><abbr title="FileNotExistsException.php">FileNotExistsException.php</abbr></a></li>
+                </ul>
+                                                                                                                                                                                                                                                                                                                                                                                                                                            <section data-search-results class="phpdocumentor-search-results phpdocumentor-search-results--hidden">
     <section class="phpdocumentor-search-results__dialog">
         <header class="phpdocumentor-search-results__header">
             <h2 class="phpdocumentor-search-results__title">Search results</h2>
diff --git a/docs/js/searchIndex.js b/docs/js/searchIndex.js
index 88fc656..4a1a216 100644
--- a/docs/js/searchIndex.js
+++ b/docs/js/searchIndex.js
@@ -1,6 +1,11 @@
 Search.appendIndex(
     [
                 {
+            "fqsen": "\\Phpolar\\CsvFileStorage\\AmbiguousUnionTypeException",
+            "name": "AmbiguousUnionTypeException",
+            "summary": "Represents\u0020when\u0020the\u0020type\u0020cannot\u0020be\u0020confidently\u0020selected\u0020from\u0020the\u0020specified\u0020union\u0020type",
+            "url": "classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html"
+        },                {
             "fqsen": "\\Phpolar\\CsvFileStorage\\CsvFileStorage",
             "name": "CsvFileStorage",
             "summary": "Allows\u0020for\u0020saving\u0020data\u0020to\u0020a\u0020CSV\u0020file.",
@@ -21,10 +26,20 @@ Search.appendIndex(
             "summary": "",
             "url": "classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_commit"
         },                {
-            "fqsen": "\\Phpolar\\CsvFileStorage\\CsvFileStorage\u003A\u003Aload\u0028\u0029",
-            "name": "load",
+            "fqsen": "\\Phpolar\\CsvFileStorage\\CsvFileStorage\u003A\u003Acount\u0028\u0029",
+            "name": "count",
+            "summary": "Get\u0020the\u0020count\u0020of\u0020items\u0020in\u0020storage",
+            "url": "classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_count"
+        },                {
+            "fqsen": "\\Phpolar\\CsvFileStorage\\FileNotExistsException",
+            "name": "FileNotExistsException",
+            "summary": "Represents\u0020when\u0020a\u0020file\u0020should\u0020exist\u0020but\u0020does\u0020not.",
+            "url": "classes/Phpolar-CsvFileStorage-FileNotExistsException.html"
+        },                {
+            "fqsen": "\\Phpolar\\CsvFileStorage\\FileNotExistsException\u003A\u003A__construct\u0028\u0029",
+            "name": "__construct",
             "summary": "",
-            "url": "classes/Phpolar-CsvFileStorage-CsvFileStorage.html#method_load"
+            "url": "classes/Phpolar-CsvFileStorage-FileNotExistsException.html#method___construct"
         },                {
             "fqsen": "\\",
             "name": "\\",
diff --git a/docs/namespaces/phpolar-csvfilestorage.html b/docs/namespaces/phpolar-csvfilestorage.html
index 401df06..4648108 100644
--- a/docs/namespaces/phpolar-csvfilestorage.html
+++ b/docs/namespaces/phpolar-csvfilestorage.html
@@ -111,8 +111,12 @@ <h3 id="interfaces_class_traits">
 
 <dl class="phpdocumentor-table-of-contents">
 
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html"><abbr title="\Phpolar\CsvFileStorage\AmbiguousUnionTypeException">AmbiguousUnionTypeException</abbr></a></dt>
+        <dd>Represents when the type cannot be confidently selected from the specified union type</dd>
             <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html"><abbr title="\Phpolar\CsvFileStorage\CsvFileStorage">CsvFileStorage</abbr></a></dt>
         <dd>Allows for saving data to a CSV file.</dd>
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html"><abbr title="\Phpolar\CsvFileStorage\FileNotExistsException">FileNotExistsException</abbr></a></dt>
+        <dd>Represents when a file should exist but does not.</dd>
 
 
     </dl>
diff --git a/docs/packages/Phpolar-CsvFileStorage.html b/docs/packages/Phpolar-CsvFileStorage.html
index f88faab..9e31277 100644
--- a/docs/packages/Phpolar-CsvFileStorage.html
+++ b/docs/packages/Phpolar-CsvFileStorage.html
@@ -111,8 +111,12 @@ <h3 id="interfaces_class_traits">
 
 <dl class="phpdocumentor-table-of-contents">
 
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-AmbiguousUnionTypeException.html"><abbr title="\Phpolar\CsvFileStorage\AmbiguousUnionTypeException">AmbiguousUnionTypeException</abbr></a></dt>
+        <dd>Represents when the type cannot be confidently selected from the specified union type</dd>
             <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-CsvFileStorage.html"><abbr title="\Phpolar\CsvFileStorage\CsvFileStorage">CsvFileStorage</abbr></a></dt>
         <dd>Allows for saving data to a CSV file.</dd>
+            <dt class="phpdocumentor-table-of-contents__entry -class"><a href="classes/Phpolar-CsvFileStorage-FileNotExistsException.html"><abbr title="\Phpolar\CsvFileStorage\FileNotExistsException">FileNotExistsException</abbr></a></dt>
+        <dd>Represents when a file should exist but does not.</dd>
 
 
     </dl>
diff --git a/src/AmbiguousUnionTypeException.php b/src/AmbiguousUnionTypeException.php
new file mode 100644
index 0000000..1ef97bc
--- /dev/null
+++ b/src/AmbiguousUnionTypeException.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phpolar\CsvFileStorage;
+
+use RuntimeException;
+
+/**
+ * Represents when the type cannot be confidently selected from the specified union type
+ */
+final class AmbiguousUnionTypeException extends RuntimeException
+{
+}
diff --git a/src/CsvFileStorage.php b/src/CsvFileStorage.php
index 6e23ca0..f2ceef2 100644
--- a/src/CsvFileStorage.php
+++ b/src/CsvFileStorage.php
@@ -7,140 +7,228 @@
 use Phpolar\Phpolar\Storage\AbstractStorage;
 use Phpolar\Phpolar\Storage\Item;
 use Phpolar\Phpolar\Storage\ItemKey;
-use Phpolar\Phpolar\Storage\KeyNotFound;
-use RuntimeException;
+use Countable;
+use DateTime;
+use DateTimeImmutable;
+use DomainException;
+use ReflectionNamedType;
+use ReflectionObject;
+use ReflectionUnionType;
 
 /**
  * Allows for saving data to a CSV file.
  */
-final class CsvFileStorage extends AbstractStorage
+final class CsvFileStorage extends AbstractStorage implements Countable
 {
+    /**
+     * Where the data was be persisted to.
+     *
+     * @var resource $readStream
+     */
+    private $readStream;
+
     /**
      * Where the data will be persisted to.
      *
-     * @var resource $stream
+     * @var resource $writeStream
+     */
+    private $writeStream;
+
+    private int|false $fileSize = 0;
+
+    /**
+     * The first line of the CSV file.
+     *
+     * @var list<?string>
      */
-    private $stream;
+    private array $firstLine;
 
-    private bool $containsObjects = false;
+    private int $lineNo = -1;
 
-    private string $typeClassName;
+    private bool $closeWriteStream = true;
 
-    public function __construct(string $filename)
+    private const MEMORY_STREAM = "php://memory";
+
+    public function __construct(string $filename, private ?string $typeClassName = null)
     {
-        $stream = fopen($filename, "c+");
-        if ($stream === false) {
-            throw new RuntimeException("File or stream does not exist. Attempted to open $filename");
+        $readMode = $filename === self::MEMORY_STREAM ? "r" : "r+";
+        $writeMode = $filename === self::MEMORY_STREAM ? "a+" : "r+";
+        $readStream = fopen($filename, $readMode);
+        $writeStream = fopen($filename, $writeMode);
+        $this->closeWriteStream = $filename !== self::MEMORY_STREAM;
+        if ($writeStream === false) {
+            throw new FileNotExistsException($filename);
+        }
+        $fileInfo = fstat($writeStream);
+        if ($fileInfo !== false) {
+            $this->fileSize = $fileInfo["size"];
+        }
+        $this->writeStream = $writeStream;
+        if ($readStream !== false) {
+            $this->readStream = $readStream;
         }
-        $this->stream = $stream;
         parent::__construct();
+        rewind($this->readStream);
     }
 
     public function __destruct()
     {
-        fclose($this->stream);
+        if (is_resource($this->readStream) === true) {
+            fclose($this->readStream);
+        }
+        if ($this->closeWriteStream === true) {
+            fsync($this->writeStream);
+            fclose($this->writeStream);
+        }
     }
 
     public function commit(): void
     {
-        $data = $this->getAll();
-        if (count($data) > 0) {
-            $firstRecord = $data[0];
-            if (is_object($firstRecord) === true) {
-                $this->typeClassName = get_class($firstRecord);
-                $firstRecord = get_object_vars($firstRecord);
-                $this->containsObjects = true;
-            }
-            if (is_array($firstRecord) === true) {
-                $headers = array_keys($firstRecord);
-                fputcsv($this->stream, $headers);
+        foreach ($this->getAll() as $record) {
+            $this->typeClassName ??= is_object($record) === true ? get_class($record) : null;
+            switch (true) {
+                case is_object($record):
+                    fputcsv($this->writeStream, $this->convertObjVars($record));
+                    break;
+                case is_scalar($record):
+                    fputcsv($this->writeStream, [$record]);
+                    break;
+                case is_array($record):
+                    fputcsv($this->writeStream, $record);
+                    break;
+                default:
+                    throw new DomainException("Invalid value. Only objects, scalars, and arrays are allowed.");
             }
         }
-        foreach ($data as $record) {
-            if (is_object($record) === true) {
-                /**
-                 * @var array<string,bool|float|int|string|null> $objAsArray
-                 */
-                $objAsArray = array_filter(get_object_vars($record), is_scalar(...));
-                fputcsv($this->stream, $objAsArray);
-            }
-            if (is_scalar($record) === true) {
-                fputcsv($this->stream, [$record]);
-            }
-            if (is_array($record) === true) {
-                fputcsv($this->stream, $record);
-            }
-        }
-        rewind($this->stream);
+        rewind($this->writeStream);
+    }
+
+    /**
+     * @return array<int|string, string>
+     */
+    private function convertObjVars(object $record): array
+    {
+        return array_map(
+            static fn (mixed $item) => match (true) {
+                $item instanceof DateTimeImmutable => $item->format(DATE_RSS),
+                is_scalar($item) => (string) $item,
+                default => "",
+            },
+            get_object_vars($record),
+        );
     }
 
-    public function load(): void
+    /**
+     * Get the count of items in storage
+     */
+    public function count(): int
     {
-        $firstLine = fgetcsv($this->stream);
-        if ($firstLine === false) {
-            $this->clear();
+        return $this->getCount();
+    }
+
+    protected function load(): void
+    {
+        if ($this->fileSize === 0) {
             return;
         }
-        $headers = array_values(array_filter($firstLine));
-        while (($line = fgetcsv($this->stream)) !== false) {
-            $isScalar = count($line) === 1;
-            $hasNoHeaders = count($headers) === 0 && count($line) > 0;
-            $headers = $hasNoHeaders === true ? range(0, count($line) - 1) : $headers;
-            match (true) {
-                $isScalar => $this->storeScalarLine($line),
-                $hasNoHeaders && $this->containsObjects => throw new RuntimeException("Malformed csv file"),
-                $this->containsObjects => $this->storeObjLine($headers, $line),
-                default => $this->storeLine($headers, $line),
-            };
+        $this->setFirstLine();
+        if ($this->hasEmptyHeader() === true) {
+            throw new DomainException("Malformed CSV file");
+        }
+
+        if ($this->hasObjects() === false) {
+            $this->storeLine($this->firstLine);
         }
-        $hasOneLine = $this->getCount() === 0 && count($headers) !== 0;
-        if ($hasOneLine === true) {
-            $indexes = range(0, count($headers) - 1);
-            $this->storeLine($indexes, $headers);
+        while (($line = fgetcsv($this->readStream)) !== false) {
+            $this->storeLine($line);
+        }
+        if (count($this) === 0) {
+            throw new DomainException("Malformed CSV file");
         }
-        rewind($this->stream);
     }
 
-    /**
-     * @param list<?string> $line
-     */
-    private function storeScalarLine(array $line): void
+    private function hasEmptyHeader(): bool
     {
-        $item = new Item($line[0]);
-        $key = $this->getOrGenerateKey($item);
-        $this->storeByKey($key, $item);
+        return count(array_filter($this->firstLine)) === 0;
+    }
+
+    private function hasObjects(): bool
+    {
+        return $this->typeClassName !== null;
+    }
+
+    private function setFirstLine(): void
+    {
+        $line = fgetcsv($this->readStream);
+        if ($line !== false) {
+            $this->firstLine ??= $line;
+        }
     }
 
     /**
-     * @param array<int|string> $headers
+     * @param array<int,non-empty-string> $headers
      * @param list<?string> $line
      */
     private function storeObjLine(array $headers, array $line): void
     {
+        // @codeCoverageIgnoreStart
+        if ($this->typeClassName === null) {
+            return;
+        }
+        // @codeCoverageIgnoreEnd
         $className = $this->typeClassName;
         $obj = new $className();
+        $reflectionObj = new ReflectionObject($obj);
         foreach (array_combine($headers, $line) as $propName => $propValue) {
-            $obj->$propName = $propValue;
+            $reflectionProp = $reflectionObj->getProperty($propName);
+            $propType = $reflectionProp->getType();
+            $obj->$propName = match (true) {
+                $propType instanceof ReflectionNamedType => match (strtolower($propType->getName())) {
+                    "bool" => (bool) $propValue,
+                    "int" => (int) $propValue,
+                    "float" => (float) $propValue,
+                    default => $propValue,
+                },
+                $propType instanceof ReflectionUnionType => match (true) {
+                    $this->containsType("string", $propType->getTypes()) => (string) $propValue,
+                    $this->containsType("int", $propType->getTypes()) => (int) $propValue,
+                    $this->containsType("float", $propType->getTypes()) => (float) $propValue,
+                    $this->containsType("bool", $propType->getTypes()) => (bool) $propValue,
+                    $this->containsType(DateTimeImmutable::class, $propType->getTypes()) =>
+                        new DateTimeImmutable($propValue ?? "19700101 000000"),
+                    $this->containsType(DateTime::class, $propType->getTypes()) =>
+                        new DateTime($propValue ?? "19700101 000000"),
+                    default => throw new AmbiguousUnionTypeException(),
+                },
+                default => $propValue,
+            };
         }
         $item = new Item($obj);
-        $key = $this->getOrGenerateKey($item);
+        $key = new ItemKey(++$this->lineNo);
         $this->storeByKey($key, $item);
     }
 
     /**
-     * @param array<int|string> $headers
-     * @param list<?string> $line
+     * @param string $needle
+     * @param ReflectionNamedType[] $namedTypes
      */
-    private function storeLine(array $headers, array $line): void
+    private function containsType(string $needle, array $namedTypes): bool
     {
-        $item = new Item(array_combine($headers, $line));
-        $key = $this->getOrGenerateKey($item);
-        $this->storeByKey($key, $item);
+        $haystack = array_map(static fn (ReflectionNamedType $type) => $type->getName(), $namedTypes);
+        return in_array($needle, $haystack);
     }
 
-    private function getOrGenerateKey(Item $item): ItemKey
+    /**
+     * @param list<?string> $line
+     */
+    private function storeLine(array $line): void
     {
-        $maybeKey = $this->findKey($item);
-        return $maybeKey instanceof KeyNotFound ? new ItemKey(uniqid()) : $maybeKey;
+        if ($this->hasObjects() === true) {
+            $this->storeObjLine(array_filter($this->firstLine), $line);
+            return;
+        }
+        $item = new Item(array_combine(range(0, count($this->firstLine) - 1), $line));
+        $key = new ItemKey(++$this->lineNo);
+        $this->storeByKey($key, $item);
     }
 }
diff --git a/src/FileNotExistsException.php b/src/FileNotExistsException.php
new file mode 100644
index 0000000..6ea1f75
--- /dev/null
+++ b/src/FileNotExistsException.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phpolar\CsvFileStorage;
+
+use RuntimeException;
+
+/**
+ * Represents when a file should exist but does not.
+ */
+final class FileNotExistsException extends RuntimeException
+{
+    public function __construct(string $filename)
+    {
+        parent::__construct("File or writeStream does not exist. Attempted to open $filename");
+    }
+}
diff --git a/tests/__fakes__/FakeValueObject.php b/tests/__fakes__/FakeValueObject.php
index 9c5378c..5951a25 100644
--- a/tests/__fakes__/FakeValueObject.php
+++ b/tests/__fakes__/FakeValueObject.php
@@ -6,8 +6,14 @@
 
 final class FakeValueObject
 {
-    public function __construct(public string $title = "Add a fake model", public string $myInput = "what")
-    {
+    public function __construct(
+        public string $title = "Add a fake model",
+        public string $myInput = "what",
+        public int $myInt = 0,
+        public bool $myBool = false,
+        public ?string $myNull = null,
+        public float $myFloat = 1e1,
+    ) {
     }
 
     public function equals(self $other): bool
diff --git a/tests/__fakes__/FakeValueObjectWithUnions.php b/tests/__fakes__/FakeValueObjectWithUnions.php
new file mode 100644
index 0000000..b0aec5d
--- /dev/null
+++ b/tests/__fakes__/FakeValueObjectWithUnions.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phpolar\CsvFileStorage\Tests\Fakes;
+
+use DateTime;
+use DateTimeImmutable;
+
+final class FakeValueObjectWithUnions
+{
+    public string|int $strUn;
+    public int|float $intUn;
+    public float|bool $floatUn;
+    public bool|object $boolUn;
+    public DateTime|array $dateTimeUn;
+    public DateTimeImmutable|array $dateTimeImmUn;
+    public $noType;
+}
diff --git a/tests/__fakes__/FakeValueObjectWithUnionsError.php b/tests/__fakes__/FakeValueObjectWithUnionsError.php
new file mode 100644
index 0000000..5ec9961
--- /dev/null
+++ b/tests/__fakes__/FakeValueObjectWithUnionsError.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phpolar\CsvFileStorage\Tests\Fakes;
+
+use Generator;
+use Traversable;
+
+final class FakeValueObjectWithUnionsError
+{
+    public Generator|Traversable $confusingUn;
+}
diff --git a/tests/__fakes__/object-2.csv b/tests/__fakes__/object-2.csv
new file mode 100644
index 0000000..dba4d47
--- /dev/null
+++ b/tests/__fakes__/object-2.csv
@@ -0,0 +1,3 @@
+title,myInput,myInt,myBool,myNull,myFloat
+"some title 1","some value 1",,,1.0,
+"some title 2","some value 2",1,true,,1.0
diff --git a/tests/__fakes__/object-malformed.csv b/tests/__fakes__/object-malformed.csv
new file mode 100644
index 0000000..cc56019
--- /dev/null
+++ b/tests/__fakes__/object-malformed.csv
@@ -0,0 +1 @@
+title,myInput,myInt,myBool,myNull
diff --git a/tests/__fakes__/object-unions-malformed.csv b/tests/__fakes__/object-unions-malformed.csv
new file mode 100644
index 0000000..51e0026
--- /dev/null
+++ b/tests/__fakes__/object-unions-malformed.csv
@@ -0,0 +1,2 @@
+confusingUn
+"some title"
diff --git a/tests/__fakes__/object-unions.csv b/tests/__fakes__/object-unions.csv
new file mode 100644
index 0000000..75e8fdf
--- /dev/null
+++ b/tests/__fakes__/object-unions.csv
@@ -0,0 +1,2 @@
+strUn,intUn,floatUn,boolUn,dateTimeUn,dateTimeImmUn,noType
+"some title",1,2.0,true,"2022-02-23 12:00:00","2022-02-23 12:00:00",what
diff --git a/tests/__fakes__/object.csv b/tests/__fakes__/object.csv
new file mode 100644
index 0000000..5ee9ad2
--- /dev/null
+++ b/tests/__fakes__/object.csv
@@ -0,0 +1,2 @@
+title,myInput,myInt,myBool,myNull,myFloat
+"some title","some value",,,,1.0
diff --git a/tests/unit/CsvFileStorageTest.php b/tests/unit/CsvFileStorageTest.php
index d446d76..e9fa8b6 100644
--- a/tests/unit/CsvFileStorageTest.php
+++ b/tests/unit/CsvFileStorageTest.php
@@ -4,21 +4,37 @@
 
 namespace Phpolar\CsvFileStorage;
 
-use Exception;
+use DomainException;
 use Phpolar\CsvFileStorage\Tests\Fakes\FakeValueObject;
+use Phpolar\CsvFileStorage\Tests\Fakes\FakeValueObjectWithUnions;
+use Phpolar\CsvFileStorage\Tests\Fakes\FakeValueObjectWithUnionsError;
 use Phpolar\Phpolar\Storage\Item;
 use Phpolar\Phpolar\Storage\ItemKey;
+use Phpolar\Phpolar\Storage\ItemNotFound;
 use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
-use ReflectionProperty;
-use RuntimeException;
 
 #[CoversClass(CsvFileStorage::class)]
+#[CoversClass(FileNotExistsException::class)]
+#[CoversClass(AmbiguousUnionTypeException::class)]
 final class CsvFileStorageTest extends TestCase
 {
     protected $stream = "php://memory";
 
+    protected string $filename;
+
+    protected function setUp(): void
+    {
+        $this->filename = tempnam(sys_get_temp_dir(), uniqid());
+    }
+
+    protected function tearDown(): void
+    {
+        file_exists($this->filename) && unlink($this->filename);
+    }
+
     #[TestDox("Shall save objects to file")]
     public function test1()
     {
@@ -29,7 +45,6 @@ public function test1()
         $key0 = new ItemKey(0);
         $sut->storeByKey($key0, $item0);
         $sut->commit();
-        $sut->load();
         $stored = $sut->getByKey($key0);
         $this->assertObjectEquals($expected, $stored->bind());
     }
@@ -44,7 +59,6 @@ public function test2()
         $key0 = new ItemKey(0);
         $sut->storeByKey($key0, $item0);
         $sut->commit();
-        $sut->load();
         $stored = $sut->getByKey($key0)->bind();
         $this->assertSame($expected, $stored);
     }
@@ -52,27 +66,28 @@ public function test2()
     #[TestDox("Shall save scalar values to file")]
     public function test3()
     {
-        $sut = new CsvFileStorage($this->stream);
+        $warningHandler = static fn () => true;
+        set_error_handler($warningHandler, E_WARNING);
+        $sut = new CsvFileStorage($this->filename);
         $givenValue = 2 ** 44;
         $expected = $givenValue;
         $item0 = new Item($givenValue);
         $key0 = new ItemKey(0);
         $sut->storeByKey($key0, $item0);
         $sut->commit();
-        $sut->load();
-        $stored = $sut->getByKey($key0)->bind();
-        $this->assertSame($expected, $stored);
+        unset($sut);
+        $sut2 = new CsvFileStorage($this->filename);
+        $stored = $sut2->getByKey($key0)->bind();
+        $this->assertCount(1, $stored);
+        $this->assertEquals($expected, $stored[0]);
+        restore_error_handler();
     }
 
-    #[TestDox("Shall clear the internal data if no data is on file and load is called")]
+    #[TestDox("Shall be empty if no data is on file")]
     public function test4()
     {
+
         $sut = new CsvFileStorage($this->stream);
-        $givenValue = 2 ** 44;
-        $item0 = new Item($givenValue);
-        $key0 = new ItemKey(0);
-        $sut->storeByKey($key0, $item0);
-        $sut->load();
         $shouldBeEmpty = $sut->getAll();
         $this->assertEmpty($shouldBeEmpty);
     }
@@ -81,34 +96,22 @@ public function test4()
     public function test5()
     {
         $sut = new CsvFileStorage("tests/__fakes__/without-headers.csv");
-        $sut->load();
         $fromFile = $sut->getAll();
         $this->assertNotEmpty($fromFile);
     }
 
-    #[TestDox("Shall load data if header line has empty values")]
+    #[TestDox("Shall throw an exception if file has more than one line and header line has empty values")]
     public function test6()
     {
-        $expected = [["some", "empty", "headers"]];
-        $sut = new CsvFileStorage("tests/__fakes__/empty-headers.csv");
-        $sut->load();
-        $fromFile = $sut->getAll();
-        $this->assertSame($expected, $fromFile);
+        $this->expectException(DomainException::class);
+        new CsvFileStorage("tests/__fakes__/empty-headers.csv");
     }
 
     #[TestDox("Shall throw an exception if storage contains object types but file has no headers")]
     public function test7()
     {
-        $this->expectException(RuntimeException::class);
-        $sut = new CsvFileStorage("tests/__fakes__/empty-headers.csv");
-        $givenObject = new FakeValueObject();
-        $privateProp = new ReflectionProperty($sut, "containsObjects");
-        $privateProp->setAccessible(true);
-        $privateProp->setValue($sut, true);
-        $item0 = new Item($givenObject);
-        $key0 = new ItemKey(0);
-        $sut->storeByKey($key0, $item0);
-        $sut->load();
+        $this->expectException(DomainException::class);
+        new CsvFileStorage("tests/__fakes__/empty-headers.csv", FakeValueObject::class);
     }
 
     #[TestDox("Shall throw an exception if stream does not exist")]
@@ -116,8 +119,66 @@ public function test8()
     {
         $warningHandler = static fn () => true;
         set_error_handler($warningHandler, E_WARNING);
-        $this->expectException(RuntimeException::class);
+        $this->expectException(FileNotExistsException::class);
         new CsvFileStorage("php://non-existing-stream-handle");
         restore_error_handler();
     }
+
+    #[TestDox("Shall load objects from file")]
+    public function testa()
+    {
+        $sut = new CsvFileStorage("tests/__fakes__/object.csv", FakeValueObject::class);
+        $itemKey = new ItemKey(0);
+        $item = $sut->getByKey($itemKey);
+        $this->assertNotInstanceOf(ItemNotFound::class, $item);
+    }
+
+    #[TestDox("Shall load more than one object from file")]
+    public function testb()
+    {
+        $sut = new CsvFileStorage("tests/__fakes__/object-2.csv", FakeValueObject::class);
+        $this->assertCount(2, $sut);
+    }
+
+    #[TestDox("Shall throw an exception if attempting to load object from file with one line")]
+    public function testc()
+    {
+        $this->expectException(DomainException::class);
+        new CsvFileStorage("tests/__fakes__/object-malformed.csv", FakeValueObject::class);
+    }
+
+    #[TestDox("Shall not set first line when file is empty")]
+    public function testd()
+    {
+        $sut = new CsvFileStorage($this->stream);
+        $this->assertCount(0, $sut);
+    }
+
+    #[TestDox("Shall parse into target object having union types")]
+    public function teste()
+    {
+        $sut = new CsvFileStorage("tests/__fakes__/object-unions.csv", FakeValueObjectWithUnions::class);
+        $this->assertContainsOnlyInstancesOf(FakeValueObjectWithUnions::class, $sut->getAll());
+    }
+
+    #[TestDox("Shall throw an exception when the union type is ambiguous")]
+    #[Group("me")]
+    public function testf()
+    {
+        $this->expectException(AmbiguousUnionTypeException::class);
+        new CsvFileStorage("tests/__fakes__/object-unions-malformed.csv", FakeValueObjectWithUnionsError::class);
+    }
+
+    #[TestDox("Shall throw an exception when an invalid value is commited")]
+    public function testg()
+    {
+        $this->expectException(DomainException::class);
+        $sut = new CsvFileStorage($this->stream);
+        $invalid = fopen("php://memory", "r");
+        fclose($invalid);
+        $key = new ItemKey(0);
+        $item = new Item($invalid);
+        $sut->storeByKey($key, $item);
+        $sut->commit();
+    }
 }