diff --git a/Upsilon/StandardLibraries/StaticScope.cs b/Upsilon/StandardLibraries/StaticScope.cs
index 1841924..0b1af37 100644
--- a/Upsilon/StandardLibraries/StaticScope.cs
+++ b/Upsilon/StandardLibraries/StaticScope.cs
@@ -140,26 +140,48 @@ namespace Upsilon.StandardLibraries
 
         private static Type DeriveValidTypes(System.Type type)
         {
+            var typeCode = System.Type.GetTypeCode(type);
+            switch (typeCode)
+            {
+                case TypeCode.Boolean:
+                    return Type.Boolean;
+                case TypeCode.Byte:
+                case TypeCode.SByte:
+                case TypeCode.Decimal:
+                case TypeCode.Double:
+                case TypeCode.Single:
+                case TypeCode.Int16:
+                case TypeCode.Int32:
+                case TypeCode.Int64:
+                case TypeCode.UInt16:
+                case TypeCode.UInt32:
+                case TypeCode.UInt64:
+                    return Type.Number;
+                case TypeCode.Char:
+                case TypeCode.String:
+                    return Type.String;
+                case TypeCode.Object:
+                    // allows every type
+                    return (Type) 255;
+            }
             if (type == typeof(ScriptString))
                 return Type.String;
             if (typeof(ScriptNumber).IsAssignableFrom(type))
                 return Type.Number;
             if (type == typeof(ScriptBoolean))
                 return Type.Boolean;
-            if (type == typeof(IIterable))
-                return Type.Table | Type.UserData;
             if (typeof(ScriptTable).IsAssignableFrom(type))
                 return Type.Table;
             if (type == typeof(ScriptType))
                 // allows every type
                 return (Type) 255;
-            if (type == typeof(object))
-                // allows every type
-                return (Type) 255;
+
+
+            if (type == typeof(IIterable))
+                return Type.Table | Type.UserData;
+
             if (type.IsEnum)
-                return Type.Number;
-            if (type == typeof(string))
-                return Type.String;
+                return Type.UserData | Type.Number;
             if (typeof(IEnumerable).IsAssignableFrom(type))
                 return Type.Table | Type.UserData;
             return Type.UserData;