Inconsistency between except_ref and anyref/anyfunc

[gahaas]

This proposal spells the type except_ref with _, but the official spec and the Reference Type proposal write the reference types anyref and anyfunc without _. I think the spelling of these types should be consistent.

[rossberg]

I'd propose exnref, which is shorter while using a somewhat more established abbreviation.

(Note that anyfunc has been renamed to funcref.)

[binji]

exnref seems OK to me. I haven't seen exn much before, but a quick search shows it's common in ML- and scheme-like languages.

[gahaas]

exnref sounds good to me.

[mstarzinger]

+1 to exnref from my side as well (sorry for being late to the party).