bug#52383: 29.0.50; [suggestion] Add seq-set-subset-p to seq.el

[Lars Ingebrigtsen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

>> There are already some commands in seq that look like set commands:
>> seq-union, seq-intersection, seq-difference.
>
> Yes, but that's unfortunate, and we need to stop at some point.  These
> functions also don't really fit in seq.el.

And they're too slow to be used for even smallish sets.  So we should
grow a set.el library that is more efficient CPU-wise.  (The set
functions in seq.el are efficient RAM-wise, though.)

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