Better handling of getting valid bound type.

Upsilon/BaseTypes/TypeContainer.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Immutable;
-using System.Diagnostics;
 using Upsilon.BoundTypes;
 
 namespace Upsilon.BaseTypes

Upsilon/BoundTypes/BoundTypeHandler.cs

@@ -61,7 +61,12 @@ namespace Upsilon.BoundTypes
             }
 
             var bDef = TypeDefinitions.FirstOrDefault(x =>
-                x.Value.ValidInternalTypes.Any(validType => validType.IsAssignableFrom(type)));
+            {
+                var first = x.Value.ValidInternalTypes.FirstOrDefault();
+                if (first == null)
+                    return false;
+                return first.IsAssignableFrom(type);
+            });
             if (!bDef.Equals(default(KeyValuePair<string, BoundTypeDefinition>)))
             {
                 TypeLookup.TryAdd(type, bDef.Key);

Upsilon/BoundTypes/UserDataBoundTypeDefinition.cs

@@ -44,6 +44,8 @@ namespace Upsilon.BoundTypes
                 // We don't want the global object type to be returned
                 if (currentBaseType == typeof(object))
                     break;
+                if (currentBaseType == typeof(ValueType))
+                    break;
                 yield return currentBaseType;
                 currentBaseType = currentBaseType.BaseType;
             }