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bug#27270: display-raw-bytes-as-hex generates ambiguous output for Emacs

From: Paul Eggert
Subject: bug#27270: display-raw-bytes-as-hex generates ambiguous output for Emacs strings
Date: Tue, 26 Apr 2022 09:48:35 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 
On 4/26/22 03:06, Lars Ingebrigtsen wrote:

Your last suggestion was to output

(format "%cf" 129)
=> "\x81\x66"

I think?  Which is changing the data output.
Oh, right. Scratch that. Let's just use "\uXXXX" if multibyte, "\OOO" (octal) if unibyte. (This is only when the character precedes a hex digit.) That's simpler anyway.
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