> From: Eli Zaretskii <eliz@gnu.org>
> Date: Wed, 10 Aug 2022 15:33:20 +0300

>> > <Shrug> strange.  What is the default value?  That is
>> >
>> >    M-: (default-value 'buffer-file-coding-system) RET
>> 
>> It is nil.
>
> But of course.  Should be fixed now, thanks.

Thank you!  The C-u C-x = works now.

Back to my original recipe then:

- C-x 8 e s
- Type "sun" and RET
- C-b
- C-u C-x =

This gives me the following Help buffer:

                 position: 152 of 153 (99%), column: 6
                character: ☀ (displayed as ☀) (codepoint 9728, #o23000, #x2600)
                  charset: unicode (Unicode (ISO10646))
    code point in charset: 0x2600
                   script: symbol
                   syntax: w 	which means: word
                 category: .:Base, j:Japanese
                 to input: type "C-x 8 RET 2600" or "C-x 8 RET BLACK SUN WITH RAYS"
              buffer code: #xE2 #x98 #x80
                file code: not encodable by coding system nil
                  display: composed to form "☀️" (see below)

    Composed with the following character(s) "️" using this font:
      ftcrhb:-GOOG-Noto Color Emoji-regular-normal-normal-*-13-*-*-*-m-0-iso10646-1
    by these glyphs:
      [0 1 9728 59 16 0 17 13 4 [0 0 2]]
    with these character(s):
      ️ (#xfe0f) VARIATION SELECTOR-16

    Character code properties: customize what to show
      name: BLACK SUN WITH RAYS
      general-category: So (Symbol, Other)
      decomposition: (9728) ('☀')

    There are text properties here:
      fontified            t


I also attach a screenshot where the coloured sun overlaps with a double
quotes character.

-- 
Protesilaos Stavrou
https://protesilaos.com