uid attribute encoding

[Bryan K. Walton]

I'm trying to configure our IdP for integration with a vendor.  We need
to pass uid as the remote user attribute.  In my testing, I'm passing
the attribute "bwalton".  However, the vendor is saying that the
attribute value is coming across like:

AAdzZWNyZXQxy1bOAaCA9D1blv...

I think this is the base64 encoded version of bwalton.  If so, is there
a way to *not* encode the uid attribute value?

Thanks,
Bryan