Fix remaining PR issues

src/GraphQL.Tests/Utilities/SchemaBuilderExecutionTests.cs

@@ -329,7 +329,7 @@ interface Pet {
 
         var serviceCollection = new ServiceCollection()
             .AddScoped<PetQueryType>()
-            .AddSingleton<IGraphTypeFactory<EnumerationGraphType>, GenericGraphTypeFactory<CaseInsensitiveEnumerationGraphType>>()
+            .AddSingleton<IGraphTypeFactory<EnumerationGraphType>, DefaultGraphTypeFactory<CaseInsensitiveEnumerationGraphType>>()
             .AddGraphQL(b => b
                 .AddSchema(services =>
                 {
@@ -962,6 +962,13 @@ public override void Add(EnumValueDefinition value)
 
         _aliasValues.TryGetValue(strName.ToUpperInvariant(), out value);
 
+        if (value != null)
+        {
+            return value;
+        }
+
+        _aliasValues.TryGetValue(strName.ToConstantCase(), out value);
+
         return value;
     }
 }

src/GraphQL/Types/DefaultGraphTypeFactory.cs

@@ -0,0 +1,13 @@
+namespace GraphQL.Types;
+
+/// <summary>
+/// A generic factory to create instances of specific <typeparamref name="TGraphType"/> implementations from parameterless constructors.
+/// </summary>
+public class DefaultGraphTypeFactory<TGraphType> : IGraphTypeFactory<TGraphType> where TGraphType : IGraphType
+{
+    /// <summary>
+    /// Create a new instance of <typeparamref name="TGraphType"/>. Requires a parameterless constructor.
+    /// </summary>
+    /// <returns></returns>
+    public TGraphType Create() => Activator.CreateInstance<TGraphType>();
+}

src/GraphQL/Types/IGraphTypeFactory.cs

@@ -1,12 +1,12 @@
 namespace GraphQL.Types;
 
 /// <summary>
-/// A factory to create instances of specific TGraphType implementations.
+/// A factory to create instances of specific <typeparamref name="TGraphType"/> implementations.
 /// </summary>
 public interface IGraphTypeFactory<out TGraphType> where TGraphType : IGraphType
 {
     /// <summary>
-    /// Create a new instance of TGraphType
+    /// Create a new instance of <typeparamref name="TGraphType"/>
     /// </summary>
     /// <returns></returns>
     public TGraphType Create();