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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: Unset array doesn't work
Date: Thu, 1 Mar 2018 08:26:10 -0500
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On Thu, Mar 01, 2018 at 10:34:30AM +0800, Clark Wang wrote:
> Look at your answer to my question 6 years ago:
> http://lists.gnu.org/archive/html/bug-bash/2012-04/msg00186.html

I'm supposed to remember stuff from 6 years ago?  Well crap, I'm in
trouble then.

Seriously, this behavior needs to be documented.