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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Sat, 4 Apr 2015 14:25:24 -0700
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Comments: In reply to Bart Schaefer <schaefer@brasslantern.com>
        "Re: How to trap EXIT like in bash" (Apr  4,  1:55pm)
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To: zsh-users@zsh.org
Subject: Re: How to trap EXIT like in bash
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On Apr 4,  1:55pm, Bart Schaefer wrote:
}
} http://www.zsh.org/mla/workers//2004/msg00460.html
} 
} It seems asserted in that thread that the Bash behavior is not only not
} compatible with FreeBSD, but is also not POSIX compliant, which is why
} the default for zsh got changed.

Hmm, except that the NEWS file and the early part of that thread claim
that TRAPS_ASYNC is the default for zsh because of historic behavior,
but then workers/19858 changes OPT_EMULATE|OPT_NONBOURNE to 0 so that
TRAPS_ASYNC is never on by default.

Was this just a botch in 19858 (should have been OPT_ZSH ?) that no one
ever noticed?  I can't tell from the archived discussion whether this was
done intentionally.