Removed reference to webmozart/assert dependency in sources, since …

…we are not requiring it ourselves

All code paths using `webmozart/assert` were mostly type-checks about unhappy paths that should not (in theory)
be possible.

Ref: #572 (comment)

src/Reflection/Adapter/ReflectionClass.php

@@ -13,11 +13,12 @@
 use Roave\BetterReflection\Reflection\ReflectionMethod as BetterReflectionMethod;
 use Roave\BetterReflection\Reflection\ReflectionObject as BetterReflectionObject;
 use Roave\BetterReflection\Reflection\ReflectionProperty as BetterReflectionProperty;
-use Webmozart\Assert\Assert;
 use function array_combine;
 use function array_map;
 use function array_values;
+use function assert;
 use function func_num_args;
+use function is_array;
 use function is_object;
 use function is_string;
 use function sprintf;
@@ -333,8 +334,8 @@ public function getTraits()
             }, $traits)
         );
 
-        Assert::isArray(
-            $traitsByName,
+        assert(
+            is_array($traitsByName),
             sprintf(
                 'Could not create an array<trait-string, ReflectionClass> for class "%s"',
                 $this->betterReflectionClass->getName()

src/Reflection/Adapter/ReflectionObject.php

@@ -10,11 +10,12 @@
 use Roave\BetterReflection\Reflection\ReflectionMethod as BetterReflectionMethod;
 use Roave\BetterReflection\Reflection\ReflectionObject as BetterReflectionObject;
 use Roave\BetterReflection\Reflection\ReflectionProperty as BetterReflectionProperty;
-use Webmozart\Assert\Assert;
 use function array_combine;
 use function array_map;
 use function array_values;
+use function assert;
 use function func_num_args;
+use function is_array;
 use function sprintf;
 use function strtolower;
 
@@ -286,10 +287,10 @@ public function getTraits()
             }, $traits)
         );
 
-        Assert::isArray(
-            $traitsByName,
+        assert(
+            is_array($traitsByName),
             sprintf(
-                'Could not create an array<trait-string, ReflectionClass> for object of type "%s"',
+                'Could not create an array<trait-string, ReflectionClass> for class "%s"',
                 $this->betterReflectionObject->getName()
             )
         );

src/Util/GetFirstDocComment.php

@@ -6,7 +6,8 @@
 
 use PhpParser\Comment\Doc;
 use PhpParser\NodeAbstract;
-use Webmozart\Assert\Assert;
+use function assert;
+use function is_string;
 
 /**
  * @internal
@@ -18,7 +19,8 @@ public static function forNode(NodeAbstract $node) : string
         foreach ($node->getComments() as $comment) {
             if ($comment instanceof Doc) {
                 $text = $comment->getReformattedText();
-                Assert::string($text);
+
+                assert(is_string($text));
 
                 return $text;
             }