[m-rev.] for post-commit review: improve diagnostics for bad number literals

[Zoltan Somogyi]

On 2023-06-19 03:21 +02:00 CEST, "Julien Fischer" <jfischer at opturion.com> wrote:
> I see no issue with
> allowing underscores before exponents.

The attached diff implements this change. For your post-commit
review of the changes to the manual and to NEWS.md (the rest
is trivial).

Zoltan.
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