Re: Disambiguate modeline character for UTF-8?

[Ulrich Mueller]

>>>>> On Fri, 07 Jul 2023, Po Lu wrote:

>>  (define-coding-system 'utf-7
>>    "UTF-7 encoding of Unicode (RFC 2152)."
>>    :coding-type 'utf-8
>> -  :mnemonic ?U
>> +  :mnemonic ?u
>>    :mime-charset 'utf-7
>>    :charset-list '(unicode)
>>    :pre-write-conversion 'utf-7-pre-write-conversion

> I thought we agreed NOT to change the mnemonic used for UTF-7, which
> also encodes the Unicode BMP.

Which isn't Unicode but only a subset, so it's reasonable that it has
a different mnemonic.