ServiceStack/ServiceStack.Text — pull request #125 by jarroda (2012-06-13 16:23:29+00:00)
Title: I fixed an issue with serializing enumerations that had unsigned base types (uint, ulong) with the Flags attribute set.  An InvalidCastException was thrown before my change.  I added unit tests to cover the code changes.

...er.cs to handle unsigned Enum types. InvalidCastException was thrown when serializing unsigned enums with the Flags attribute.