bug#42384: octal escape sequences old fashioned

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson
>  <jidanni@jidanni.org>
> Date: Thu, 16 Jul 2020 08:50:28 +0800
> Cc: rms@gnu.org
> 
> (info "(emacs) Text Display") says:
> 
>       The raw bytes with codes ‘U+0080’ (octal 200) through ‘U+009F’ (octal
>    237) are displayed as “octal escape sequences”, with the ‘escape-glyph’
>    face.  For instance, character code ‘U+0098’ (octal 230) is displayed as
>    ‘\230’.  If you change the buffer-local variable ‘ctl-arrow’ to ‘nil’,
>    the ASCII control characters are also displayed as octal escape
>    sequences instead of caret escape sequences.
> 
> OK but octal is rather old fashioned so the user should be given the
> choice of hex, etc.

We have display-raw-bytes-as-hex for that very reason.