diff --git a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet6_0.verified.md b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet6_0.verified.md
index 67bf1bb..ff41e1f 100644
--- a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet6_0.verified.md
+++ b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet6_0.verified.md
@@ -251,9 +251,9 @@
      name: string [NotNull, NotNull]
    ) : string [Extension, CanBeNull, AssertionMethod, ContractAnnotation]
  - Fail.OrFailIfWhiteSpace(
-     value: string? [Nullable, AssertionCondition, NoEnumeration],
-     name: string [NotNull, NotNull, CallerArgumentExpression, Optional]
-   ) : string [Extension, NotNull, AssertionMethod, ContractAnnotation]
+     value: string? [AssertionCondition, NoEnumeration],
+     name: string? [CallerArgumentExpression, Optional]
+   ) : string [NullableContext, Extension, NotNull, AssertionMethod, ContractAnnotation]
 
 ## Requirements.Business (abstract class)
  - Business.Requires(
diff --git a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet7_0.verified.md b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet7_0.verified.md
index 9d9e0d5..ff41e1f 100644
--- a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet7_0.verified.md
+++ b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet7_0.verified.md
@@ -251,9 +251,9 @@
      name: string [NotNull, NotNull]
    ) : string [Extension, CanBeNull, AssertionMethod, ContractAnnotation]
  - Fail.OrFailIfWhiteSpace(
-     value: string? [Nullable, AssertionCondition, NoEnumeration],
-     name: string [NotNull, NotNull]
-   ) : string [Extension, NotNull, AssertionMethod, ContractAnnotation]
+     value: string? [AssertionCondition, NoEnumeration],
+     name: string? [CallerArgumentExpression, Optional]
+   ) : string [NullableContext, Extension, NotNull, AssertionMethod, ContractAnnotation]
 
 ## Requirements.Business (abstract class)
  - Business.Requires(
diff --git a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet8_0.verified.md b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet8_0.verified.md
index 9d9e0d5..ff41e1f 100644
--- a/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet8_0.verified.md
+++ b/Contracts/Synergy.Contracts.Test/Architecture/Public/Api.of.Synergy.Contracts.DotNet8_0.verified.md
@@ -251,9 +251,9 @@
      name: string [NotNull, NotNull]
    ) : string [Extension, CanBeNull, AssertionMethod, ContractAnnotation]
  - Fail.OrFailIfWhiteSpace(
-     value: string? [Nullable, AssertionCondition, NoEnumeration],
-     name: string [NotNull, NotNull]
-   ) : string [Extension, NotNull, AssertionMethod, ContractAnnotation]
+     value: string? [AssertionCondition, NoEnumeration],
+     name: string? [CallerArgumentExpression, Optional]
+   ) : string [NullableContext, Extension, NotNull, AssertionMethod, ContractAnnotation]
 
 ## Requirements.Business (abstract class)
  - Business.Requires(
diff --git a/Contracts/Synergy.Contracts.Test/Failures/FailStringTest.cs b/Contracts/Synergy.Contracts.Test/Failures/FailStringTest.cs
index f5ae40b..8de21a3 100644
Binary files a/Contracts/Synergy.Contracts.Test/Failures/FailStringTest.cs and b/Contracts/Synergy.Contracts.Test/Failures/FailStringTest.cs differ
diff --git a/Contracts/Synergy.Contracts/Failures/FailString.cs b/Contracts/Synergy.Contracts/Failures/FailString.cs
index 6e5fdbb..927c3eb 100644
--- a/Contracts/Synergy.Contracts/Failures/FailString.cs
+++ b/Contracts/Synergy.Contracts/Failures/FailString.cs
@@ -106,17 +106,19 @@ string argumentName
         /// <param name="value">Value to check against nullability and white space.</param>
         /// <param name="name">Name of the checked argument / parameter to check.</param>
         /// <returns>Exactly the same value as provided to this method.</returns>
-        [NotNull] [return: System.Diagnostics.CodeAnalysis.NotNull]
+        [NotNull]
+        [return: System.Diagnostics.CodeAnalysis.NotNull]
         [AssertionMethod]
         [ContractAnnotation("value: null => halt; value: notnull => notnull")]
         public static string OrFailIfWhiteSpace(
-            [AssertionCondition(AssertionConditionType.IS_NOT_NULL)] [NoEnumeration] this string? value,
-#if NET6_0
-            [NotNull] [System.Diagnostics.CodeAnalysis.NotNull][System.Runtime.CompilerServices.CallerArgumentExpression("value")] string name = ""
+            [AssertionCondition(AssertionConditionType.IS_NOT_NULL)] [NoEnumeration]
+            this string? value,
+#if NET6_0_OR_GREATER
+            [System.Runtime.CompilerServices.CallerArgumentExpression("value")] string? name = null
 #else
-            [NotNull] [System.Diagnostics.CodeAnalysis.NotNull] string name
+            string name
 #endif
-            )
+        )
         {
             Fail.RequiresArgumentName(name);
 
@@ -136,7 +138,8 @@ [NotNull] [System.Diagnostics.CodeAnalysis.NotNull] string name
         [ContractAnnotation("value: null => halt")]
         public static void IfWhitespace(
             [CanBeNull, AssertionCondition(AssertionConditionType.IS_NOT_NULL)] string value,
-            [NotNull] [System.Diagnostics.CodeAnalysis.NotNull] string name)
+            [NotNull] [System.Diagnostics.CodeAnalysis.NotNull] string name
+            )
         {
             Fail.RequiresArgumentName(name);
             Fail.IfWhitespace(value, Violation.WhenWhitespace(name));
diff --git a/Web/Synergy.Web.Api.Testing/Assertions/Assertion.cs b/Web/Synergy.Web.Api.Testing/Assertions/Assertion.cs
index 750ad46..9d450e1 100644
--- a/Web/Synergy.Web.Api.Testing/Assertions/Assertion.cs
+++ b/Web/Synergy.Web.Api.Testing/Assertions/Assertion.cs
@@ -12,7 +12,7 @@ public abstract class Assertion : IAssertion
 
         public IAssertion Expected(string expected)
         {
-            ExpectedResult = expected.OrFailIfWhiteSpace(nameof(expected));
+            ExpectedResult = expected.OrFailIfWhiteSpace();
             return this;
         }
 
@@ -27,7 +27,7 @@ public struct Result
 
             public Result([NotNull] string message)
             {
-                Message = message.OrFailIfWhiteSpace(nameof(message)).Trim();
+                Message = message.OrFailIfWhiteSpace().Trim();
             }
 
             public static Result Ok => new Result(OkMessage);
diff --git a/Web/Synergy.Web.Api.Testing/HttpOperation.cs b/Web/Synergy.Web.Api.Testing/HttpOperation.cs
index 4adce38..92cb054 100644
--- a/Web/Synergy.Web.Api.Testing/HttpOperation.cs
+++ b/Web/Synergy.Web.Api.Testing/HttpOperation.cs
@@ -41,7 +41,7 @@ internal void Assert(IEnumerable<IAssertion> assertions)
 
         internal void SetDescription([NotNull] string details)
         {
-            Description = details.OrFailIfWhiteSpace(nameof(details));
+            Description = details.OrFailIfWhiteSpace();
         }
     }
 }
\ No newline at end of file
diff --git a/Web/Synergy.Web.Api.Testing/HttpOperationExtensions.cs b/Web/Synergy.Web.Api.Testing/HttpOperationExtensions.cs
index 05e5300..0018aef 100644
--- a/Web/Synergy.Web.Api.Testing/HttpOperationExtensions.cs
+++ b/Web/Synergy.Web.Api.Testing/HttpOperationExtensions.cs
@@ -9,7 +9,7 @@ public static class HttpOperationExtensions
         public static TOperation Details<TOperation>(this TOperation operation, string details)
             where TOperation : HttpOperation
         {
-            operation.SetDescription(details.OrFailIfWhiteSpace(nameof(details)));
+            operation.SetDescription(details.OrFailIfWhiteSpace());
             return operation;
         }