bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> That's just sheer luck, AFAIU (there are some characters with
> numeric-value property that are not arranged from zero to 9), but
> maybe for this particular purpose it's all that's needed.

We're only doing this check for the characters with Nd, which are
guaranteed to be organised this way.  (There's only three of these
number systems, allegedly.)

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