[m-rev.] for review: rationalise hash functions across the standard library

[Zoltan Somogyi]

On Fri, 14 Feb 2020 20:27:39 +1100 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
> You can go ahead; I won't be touching hash_table code for a few
> weeks at least.

Done. The diff is attached. It is for review by Peter, with special attention
to the new XXXs.

Peter, could you tell me why version_hash_table uses user-defined equality?
The change was done by pbone, but I hope you may have discussed the
issue with him. The discussion on m-rev in May 2013, when the user defined
equality was added, says nothing about *why* it was added, except one
possibly-relevant vague reference to "MC needing it", and I see nothing
relevant in that time frame in m-dev.

Zoltan.


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