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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: The function =?utf-8?Q?=E2=80=98cl-set-difference=E2=80=99?=
 might not be defined at runtime
Date: Wed, 15 Apr 2020 00:05:50 -0400
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> Just for curiosity, why would that be better?  Does seq load faster?

In Emacs≥27, yes.

> Or is seq more likely to be already loaded?

Probably a toss-up: both are highly likely to be already loaded in
Emacs≥27.


        Stefan