bug#63671: Add function to test equality of hash tables

[Mattias Engdegård]

24 maj 2023 kl. 19.27 skrev Joseph Turner <joseph@breatheoutbreathe.in>:

> Would extending `equal' to handle hash tables be generally useful?

It would, but doing so would be very risky at this point since it would change 
long-standing semantics.

We could make an augmented version of `equal` but what we really want is one 
that works for user-defined types (see Ihor's reference to a previous 
discussion).

Anyway, here's an old patch I had lying around, in case we decide that we do 
need a shoddy equality predicate for hash tables only.

hash-table-equal-p.diff
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