Enum usage fails when obfuscated

See http://stackoverflow.com/questions/934459

I'm beeing presented with the following Exception when trying to serialize 
a class that contains enums in an obfuscated project:

ProtoBuf.ProtoException: The default enum value X is not defined for the 
optional property Y

If I exclude all affected enums from obfuscation everything runs fine, 
however, I switched to protobuf.net to be able to obfuscate more code 
content so I hope there is a better solution.

So is it the obfuscator which messes around to much for protobuf.net or am 
I declaring my enums the wrong way?

I have tried:

    [ProtoContract]
    public enum X
    {
        Y, Z
    }
and

    [ProtoContract]
    public enum X
    {
        Y=0, Z=1
    }

Original issue reported on code.google.com by marc.gravell on 1 Jun 2009 at 11:49

tonynhan / protobuf-net

Enum usage fails when obfuscated #59