On Tue, Apr 12, 2011 at 2:07 PM, Matt W. Benjamin <matt@linuxbox.com> wrote: > I had thought of safe-union and guarded-union, I wasn't in love with these. > "extensible-union"? I could go for "safe-union", but (imho) it has some negative subtext with respect to rfc 4506, which is probably not what we want... -Tom