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(parent: 2959213) | patch

Fix misimplementation of typcache logic for extended hashing.

Fix misimplementation of typcache logic for extended hashing.

The previous coding would report that an array type supports extended
hashing if its element type supports regular hashing. This bug is
only latent at the moment, since AFAICS there is not yet any code
that depends on checking presence of extended-hashing support to make
any decisions. (And in any case it wouldn't matter unless the element
type has only regular hashing, which isn't true of any core data type.)
But that doesn't make it less broken. Extend the
cache_array_element_properties infrastructure to check this properly.

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