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Sender: Junio C Hamano <jch2355@gmail.com>
From:   Junio C Hamano <gitster@pobox.com>
To:     Eric Sunshine <sunshine@sunshineco.com>
Cc:     Jeff King <peff@peff.net>,
        =?utf-8?B?5a2f5a2Q5piT?= <mengziyi540841@gmail.com>,
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Subject: Re: bug report: symbolic-ref --short command echos the wrong text
 while use Chinese language
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Date:   Mon, 13 Feb 2023 22:45:07 -0800
In-Reply-To: <CAPig+cQx24PRUsEjEcnuDtokS02SS3n_dUi8MO=WJbBazget8g@mail.gmail.com>
        (Eric Sunshine's message of "Tue, 14 Feb 2023 01:05:20 -0500")
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Eric Sunshine <sunshine@sunshineco.com> writes:

> Using (presumably) valid LANG codes results in the buggy truncated
> output, but "LANG=C" produces the correct result:
>
>   $ for i in C en_US fr_FR de_DE ru_RU zh_CN; do printf "$i: " &&
> LANG=$i.UTF-8 git symbolic-ref --short HEAD; done
>   C: 测试-加-增加-加-增加
>   en_US: 测试-?
>   fr_FR: 测试-?
>   de_DE: 测试-?
>   ru_RU: 测试-?
>   zh_CN: 测试-?

Interesting.  

So the system cares more than just "is this a valid UTF-8 sequence?"
but somehow knows that the given sequence is a valid Chinese and not
valid English?  ---oh, no, zh_CN is rejected, but your earlier zh-CN
somehow was accepted?

Now, it is beyond my ability to guess what macOS is internally doing
wrong X-<.