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POSIX and PROMPT_BANG

X-seq: zsh-workers 41775
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: POSIX and PROMPT_BANG
Date: Wed, 27 Sep 2017 16:56:34 -0700
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By a coincidence I won't bother to explain, it has just come to my
attention that the POSIX spec says (reprhrased in zsh terminology)
that PS1 shall be interpreted as if PROMPT_BANG is set, which we do
not do by default in sh emulation (but do in ksh emulation).

However, it appears PROMPT_BANG is *not* supposed to apply to PS2 or
PS4 (PS3 is unspecified because "select" is not a POSIX feature).  Zsh
applies it the same to all prompts.

I'm not advocating doing anything about this, merely making note.

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