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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Why does using aset sometimes output raw bytes?
Date: Sun, 09 Dec 2018 22:23:28 +0200
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sun, 09 Dec 2018 14:20:07 -0500
> 
> It's not the implementation, but the semantics of unibyte/multibyte
> strings presumes that the difference doesn't matter much for ASCII-only
> strings, which is mostly true but isn't true in the case of `aset`.

The same is true about concat, btw.