diff --git a/specs/Qowaiv.Specs/Hashing/Hash_specs.cs b/specs/Qowaiv.Specs/Hashing/Hash_specs.cs
index cc18b41a..bff4e75e 100644
--- a/specs/Qowaiv.Specs/Hashing/Hash_specs.cs
+++ b/specs/Qowaiv.Specs/Hashing/Hash_specs.cs
@@ -198,7 +198,7 @@ public void displays_the_hash()
         using (Hash.WithoutRandomizer())
         {
             var hash = Hash.Code(12);
-            hash.ToString().Should().Be("12");
+            hash.ToString().Should().Be("665630175");
         }
     }
 }
diff --git a/src/Qowaiv.TestTools/EmptyTestClassAttribute.cs b/src/Qowaiv.TestTools/EmptyTestClassAttribute.cs
index 1ab6e872..581cbcdd 100644
--- a/src/Qowaiv.TestTools/EmptyTestClassAttribute.cs
+++ b/src/Qowaiv.TestTools/EmptyTestClassAttribute.cs
@@ -12,5 +12,5 @@
 public sealed class EmptyTestClassAttribute : Attribute
 {
     /// <summary>(Optional) justification for having this empty test class.</summary>
-    public string? Justification { get; set; }
+    public string? Justification { get; init; }
 }
diff --git a/src/Qowaiv.TestTools/SerializationWrapper.cs b/src/Qowaiv.TestTools/SerializationWrapper.cs
index 31a63bd8..bc73d6fe 100644
--- a/src/Qowaiv.TestTools/SerializationWrapper.cs
+++ b/src/Qowaiv.TestTools/SerializationWrapper.cs
@@ -8,5 +8,5 @@
 public sealed class SerializationWrapper<T>
 {
     /// <summary>The generic part of the wrapper.</summary>
-    public T? Value { get; set; }
+    public T? Value { get; init; }
 }
diff --git a/src/Qowaiv.TestTools/XmlStructure.TSvo.cs b/src/Qowaiv.TestTools/XmlStructure.TSvo.cs
index 9ab2ee56..643ef7bc 100644
--- a/src/Qowaiv.TestTools/XmlStructure.TSvo.cs
+++ b/src/Qowaiv.TestTools/XmlStructure.TSvo.cs
@@ -7,13 +7,13 @@ public sealed class XmlStructure<TSvo>
     where TSvo : struct
 {
     /// <summary>Gets and sets int property.</summary>
-    public int Id { get; set; } = 17;
+    public int Id { get; init; } = 17;
 
     /// <summary>Gets and sets SVO property.</summary>
-    public TSvo Svo { get; set; }
+    public TSvo Svo { get; init; }
 
     /// <summary>Gets and sets a date (time) property.</summary>
-    public DateTime Date { get; set; } = new DateTime(2017, 06, 11, 00, 00, 000, DateTimeKind.Utc);
+    public DateTime Date { get; init; } = new DateTime(2017, 06, 11, 00, 00, 000, DateTimeKind.Utc);
 
     /// <inheritdoc />
     [Pure]
diff --git a/src/Qowaiv/Formatting/FormattingArgumentsCollection.cs b/src/Qowaiv/Formatting/FormattingArgumentsCollection.cs
index 24f6a876..836db387 100644
--- a/src/Qowaiv/Formatting/FormattingArgumentsCollection.cs
+++ b/src/Qowaiv/Formatting/FormattingArgumentsCollection.cs
@@ -37,7 +37,7 @@ public FormattingArgumentsCollection(IFormatProvider? formatProvider, Formatting
     private readonly Dictionary<Type, FormattingArguments> dict = [];
 
     /// <summary>Gets the default format provider of the collection.</summary>
-    public IFormatProvider FormatProvider { get; protected set; }
+    public IFormatProvider FormatProvider { get; }
 
     /// <summary>Formats the object using the formatting arguments from the collection.</summary>
     /// <param name="obj">
@@ -476,7 +476,7 @@ public FormattingArguments Get(Type? type)
     }
 
     /// <summary>Gets a collection containing the types for the collection.</summary>
-    public ICollection<Type> Types => dict.Keys;
+    public IReadOnlyCollection<Type> Types => dict.Keys;
 
     /// <summary>Returns an enumerator that iterates through the collection.</summary>
     [Pure]
diff --git a/src/Qowaiv/SingleValueObjectAttribute.cs b/src/Qowaiv/SingleValueObjectAttribute.cs
index 31abb20c..6cd211a8 100644
--- a/src/Qowaiv/SingleValueObjectAttribute.cs
+++ b/src/Qowaiv/SingleValueObjectAttribute.cs
@@ -34,5 +34,5 @@ public SingleValueObjectAttribute(SingleValueStaticOptions staticOptions, Type u
     /// <remarks>
     /// Use this if the database type is different from the underlying type.
     /// </remarks>
-    public Type? DatabaseType { get; set; }
+    public Type? DatabaseType { get; init; }
 }
diff --git a/src/Qowaiv/Text/WildcardPattern.cs b/src/Qowaiv/Text/WildcardPattern.cs
index d3f09277..e3d4df59 100644
--- a/src/Qowaiv/Text/WildcardPattern.cs
+++ b/src/Qowaiv/Text/WildcardPattern.cs
@@ -115,19 +115,19 @@ protected virtual void GetObjectData(SerializationInfo info, StreamingContext co
     }
 
     /// <summary>The wildcard pattern options.</summary>
-    public WildcardPatternOptions Options { get; private set; }
+    public WildcardPatternOptions Options { get; init; }
 
     /// <summary>The comparison type.</summary>
-    public StringComparison ComparisonType { get; private set; }
+    public StringComparison ComparisonType { get; init; }
 
     /// <summary>The wildcard pattern.</summary>
-    protected string Pattern { get; private set; }
+    protected string Pattern { get; init; }
 
     /// <summary>The wildcard single char.</summary>
-    protected char SingleChar { get; set; }
+    protected char SingleChar { get; init; }
 
     /// <summary>The wildcard multiple chars.</summary>
-    protected char MultipleChars { get; set; }
+    protected char MultipleChars { get; init; }
 
     /// <summary>Returns true if matching is culture independent, otherwise false.</summary>
     /// <remarks>
diff --git a/src/Qowaiv/Threading/ThreadDomain.cs b/src/Qowaiv/Threading/ThreadDomain.cs
index 90b15955..84c2454a 100644
--- a/src/Qowaiv/Threading/ThreadDomain.cs
+++ b/src/Qowaiv/Threading/ThreadDomain.cs
@@ -8,7 +8,7 @@ namespace Qowaiv.Threading;
 /// <summary>Represents domain of typed instances that can be used as the
 /// default values based on the current thread.
 /// </summary>
-public class ThreadDomain
+public sealed class ThreadDomain
 {
     /// <summary>Initializes static members of the <see cref="ThreadDomain"/> class.</summary>
     static ThreadDomain()
@@ -68,10 +68,10 @@ public static void Register(Type type, Func<Thread, object> creator)
     /// <remarks>
     /// No public accessor.
     /// </remarks>
-    protected ThreadDomain() => Values = [];
+    private ThreadDomain() => Values = [];
 
     /// <summary>The underlying dictionary.</summary>
-    protected Dictionary<Type, object?> Values { get; private set; }
+    private Dictionary<Type, object?> Values { get; set; }
 
     /// <summary>Gets the current value of T.</summary>
     /// <typeparam name="T">