Support underscores for mpz/mpq assignments from strings

[Vincent Lefevre]

On 2021-06-11 18:20:01 +0200, Hans Åberg wrote:
> But you can probably cannot change mpz_set_str,

I wasn't suggesting to change mpz_set_str, but add another function.
Changing mpz_set_str to add another argument for a list of separators
would break the API.

> because it is modelled on C behavior.

It isn't. In C, whitespace isn't a separator.

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