avoid kind type dispatch bugs in tuple_type_head and tuple_type_tail #27776
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This is a much more narrowly-scoped alternative to some of the tuple code changes that were originally in #27736 (i.e. c16a109).
It would still be nice eventually to figure out alternative implementations for c16a109, since switching to
fieldtype
is more sound in general (see discussion from #27736). However, for now, this much more palatable change works around the problems that are blocking Cassette.Unfortunately, I don't have a non-Cassette test case for these bugs yet; they're pretty hard to work out MWEs for.