Encoding attributes with multiple encoders

[Rod Widdowson]

> it seems to release only the final encoded attribute.  

>From reading the code I would have expected to see the first. But I’ll confirm that that is what the AddAttributeStatementToAssertion actions do (each IdPAttribute gets encoded by a maximum of one encoder).  

I'd defer to Scott as to whether that is correct, although lack of backwards compatibility has always got to be treated with suspicion.

/Rod