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From: Ulrich Mueller <ulm@gentoo.org>
Newsgroups: gnu.bash.bug
Subject: Re: Saving/restoring of posix option unsets expand_aliases
Date: Tue, 26 Nov 2019 01:34:07 +0100
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>>>>> On Mon, 25 Nov 2019, Chet Ramey wrote:

> On 11/24/19 7:35 AM, Ulrich Mueller wrote:
>> Description:
>> In a non-interactive non-posix-mode shell, saving the output of
>> "shopt -p -o" and restoring it will unset the expand_aliases option.

> It seems like setting posix mode when it's already set, or unsetting
> it when it's not, should be a no-op instead of guaranteeing a certain
> environment (posix or default). That's easy enough.

Right, this is where I think that the current behavior is a bug.

> There's no question that setting posix mode should change the values
> of a number of bash options to produce a compliant environment.

> It's a different question whether or not unsetting posix mode should
> revert to the settings before posix mode was enabled or restore the
> default environment. It's always meant the latter.

No strong opinion about that one, but maybe the latter is the more
predictable behavior?