bug#45539: 26.3; `add-to-ordered-list': Add optional arg for :test predicate for hash table

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> Please consider adding an optional arg TEST-PREDICATE, which will be
> passed to the hash table (and which will default to `eq').

Since the ordering is hard-coded to `<', allowing the things being
compared are presumably all numbers, so allowing specifying the
comparison function doesn't make much sense.

However, using `eq' for numbers doesn't make much sense, either -- `eql'
would be better.  Looking at the in-tree usages, switching to `eql'
shouldn't make much difference, so I've done the daring thing and
switched to `eql'.

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