On Mon, 29 Jul 2019 at 14:18, L A Walsh <b...@tlinx.org> wrote:
>
> Is there a T/F var expansion that does:

[...]

>
> Sorry if this is already implemented in some form, I'm just
> not remembering there being one.

Your message is not a bug report. The list
  help-b...@gnu.org>
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