Support underscores for mpz/mpq assignments from strings

Fri Jun 11 20:23:19 UTC 2021

They don't follow it in the US even though recommended. Expect the same elsewhere.

> On 11 Jun 2021, at 18:50, Paul Leyland <paul.leyland at gmail.com> wrote:
> 
> So? Most of the worls is outside the US.
> 
> On 11/06/2021 17:20, Hans Åberg wrote:
>> 
>> The former is a likely use in the US despite NIST recommending the international standard.
>> 
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