Custom nameid getting released in version 2 but not version 3

[Cantor, Scott]

> We are using Shibboleth 3.2.1 with nameid-formats using the legacy
> generators. We define an attribute "mailNameID" with a nameid encoder in
> attribute-resolver.xml that depends on another attribute (in this case
> "mail"). In attribute-filter.xml we explicitly release "mailNameID" but
> we do _not_ release the "mail" attribute.
> 
> When we do this, the "mailNameID" does not get released. If we
> explicitly release the "mail" attribute along with "mailNameID", then
> "mailNameID" _does_ get released.

With the caveat that I'm testing on 3.3-SNAPSHOT, that is not the observed behavior. So the reason for whatever you're seeing is not captured solely by what you posted above.

-- Scott