Fix to serialization for enums

InABox.Core/Filter.cs

@@ -1401,7 +1401,7 @@ namespace InABox.Core
         {
             Expression = reader.DeserialiseExpression(typeof(T));
             Operator = (Operator)reader.ReadByte();
-            Value = DeserializeValue(reader);
+            Value = CoreUtils.ChangeType(DeserializeValue(reader), Expression.Type);
 
             Ands.Clear();
             var nAnds = reader.ReadInt32();