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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Decoding URLs input
Date: Sun, 04 Jul 2021 07:22:25 +0300
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 (message from Yuri Khan on Sun, 4 Jul 2021 03:16:37 +0700)
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> From: Yuri Khan <yuri.v.khan@gmail.com>
> Date: Sun, 4 Jul 2021 03:16:37 +0700
> 
> I just fed it some percent-encoded sequences that I knew would result
> in invalid UTF-8 when decoded. If it were doing a full decode, I
> expected it to signal an error. It didn’t.

That's not a reliable sign that a function returns unibyte strings.
Most Emacs APIs that decode strings don't signal errors if they
encounter invalid sequences; instead, they decode those into raw
bytes.  The design principle is to support raw bytes in strings and
let the application deal with them if they are not expected.