diff --git a/src/System.Linq.Dynamic.Core/Parser/KeywordsHelper.cs b/src/System.Linq.Dynamic.Core/Parser/KeywordsHelper.cs
index 1e816384..977aebb5 100644
--- a/src/System.Linq.Dynamic.Core/Parser/KeywordsHelper.cs
+++ b/src/System.Linq.Dynamic.Core/Parser/KeywordsHelper.cs
@@ -29,10 +29,10 @@ internal class KeywordsHelper : IKeywordsHelper
     private readonly Dictionary<string, AnyOf<string, Expression, Type>> _mappings;
 
     // Pre-defined Types are not IgnoreCase
-    private static readonly Dictionary<string, Type> PreDefinedTypeMapping = new();
+    private static readonly Dictionary<string, Type> PreDefinedTypeMapping = [];
 
     // Custom DefinedTypes are not IgnoreCase
-    private readonly Dictionary<string, Type> _customTypeMapping = new();
+    private readonly Dictionary<string, Type> _customTypeMapping = [];
 
     static KeywordsHelper()
     {
diff --git a/test/System.Linq.Dynamic.Core.Tests/DynamicExpressionParserTests.cs b/test/System.Linq.Dynamic.Core.Tests/DynamicExpressionParserTests.cs
index 4417d1a0..5ad3338d 100644
--- a/test/System.Linq.Dynamic.Core.Tests/DynamicExpressionParserTests.cs
+++ b/test/System.Linq.Dynamic.Core.Tests/DynamicExpressionParserTests.cs
@@ -82,7 +82,7 @@ public int this[int i1]
             get => i1 + "-" + i2;
         }
     }
-    
+
     private class ComplexParseLambda1Result
     {
         public int? Age;
@@ -730,7 +730,7 @@ public void DynamicExpressionParser_ParseLambda_Indexer1D()
         // Assert
         Check.That(result).Equals(4);
     }
-    
+
     [Fact]
     public void DynamicExpressionParser_ParseLambda_Indexer2D()
     {
@@ -757,7 +757,7 @@ public void DynamicExpressionParser_ParseLambda_Indexer2D()
         // Assert
         Check.That(result).Equals("3-1");
     }
-    
+
     [Fact]
     public void DynamicExpressionParser_ParseLambda_IndexerParameterMismatch()
     {
@@ -772,11 +772,32 @@ public void DynamicExpressionParser_ParseLambda_IndexerParameterMismatch()
         {
             Expression.Parameter(typeof(ClassWithIndexers), "myObj")
         };
-        
+
         Assert.Throws<ParseException>(() =>
             DynamicExpressionParser.ParseLambda(config, false, expressionParams, null, "myObj[3,\"1\",1]"));
     }
 
+    [Fact]
+    public void DynamicExpressionParser_ParseLambda_Int16_CaseSensitive_IsValid()
+    {
+        // Act
+        var lambda = DynamicExpressionParser.ParseLambda(typeof(object), null, "Int16(5)");
+        var result = lambda.Compile().DynamicInvoke("x");
+
+        // Assert
+        result.Should().Be(5);
+    }
+
+    [Fact]
+    public void DynamicExpressionParser_ParseLambda_Int16_CaseInsensitive_Throws()
+    {
+        // Act
+        Action act = () => DynamicExpressionParser.ParseLambda(typeof(object), null, "int16(5)");
+
+        // Assert
+        act.Should().Throw<ParseException>();
+    }
+
     [Fact]
     public void DynamicExpressionParser_ParseLambda_DuplicateParameterNames_ThrowsException()
     {
@@ -989,7 +1010,7 @@ public void DynamicExpressionParser_ParseLambda_HexToLong(string expression, lon
         var parameters = Array.Empty<ParameterExpression>();
 
         // Act
-        var lambda = DynamicExpressionParser.ParseLambda( parameters, typeof(long), expression);
+        var lambda = DynamicExpressionParser.ParseLambda(parameters, typeof(long), expression);
         var result = lambda.Compile().DynamicInvoke();
 
         // Assert
@@ -2372,6 +2393,6 @@ public DefaultDynamicLinqCustomTypeProviderForGenericExtensionMethod() : base(Pa
         }
 
         public override HashSet<Type> GetCustomTypes() =>
-            [..base.GetCustomTypes(), typeof(Methods), typeof(MethodsItemExtension)];
+            [.. base.GetCustomTypes(), typeof(Methods), typeof(MethodsItemExtension)];
     }
 }
\ No newline at end of file