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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [Emacs-diffs] master f18af6c: Audit use of lsh and fix glitches
Date: Wed, 22 Aug 2018 17:52:05 +0300
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> From: Pip Cet <pipcet@gmail.com>
> Date: Wed, 22 Aug 2018 13:49:13 +0000
> Cc: eggert@cs.ucla.edu, emacs-devel@gnu.org
> 
> That's precisely why `most-positive-fixnum' is dangerous to rely on:
> if you use it for performance tuning, you're likely to make the wrong
> decision, by going through an expensive alternative bignum
> implementation.

We want most-positive-fixnum so that we could make the right
decisions.