[RFC] Doubts about digit grouping corner cases

[Paolo Carlini]

Paolo Carlini wrote:

> It seems to me that we could deal easily - and in a strictly conforming
> way - with __sep_pos == 0 in __verify_grouping, thus simplifying the
> Stage2 parsing loop.

For concreteness, the below is what I have in mind (+ the corresponding
tweaks to a few testcases and a consistent change to money_get::do_get,
which also uses __verify_grouping).

Paolo.

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