[PATCH 1 of 2 v3] config: add hasconfig method and supporting plumbing

[Bryan O'Sullivan]

On Sat, Jan 9, 2016 at 12:08 AM, Yuya Nishihara <yuya at tcha.org> wrote:

> > Sadly, this will happily return unspecified regardless of whether no
> > value was provided or an empty value was specified.
>
> No, it should return unspecified only if no value was provided, i.e.
> val is None.
>

Maybe that's what it *should* do, but I am describing what it actually does
today :-)
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