datatype: handle concrete type intersections that happen #49017
Merged
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This is actually very similar to the current might_intersect_concrete, but for subtyping and memoized. It replaces cached_by_hash, which was a confusingly-named incomplete prior work towards this.
This gives NamedTuple{(:names)} hashes, which lets them go into the faster type lookup tables. This is a fairly common type for some packages to create, so we need this to avoid polluting our cache tables.
Reverts efafd83, since these types have no intersection, the morespecific algorithm is no longer required to have any opinion on them.