Converting a decimal string to mpq_t

[Vincent Lefevre]

On 2025-04-29 07:30:22 +0200, Anders Andersson wrote:
> Neither will work, 0.1 is even an example in the mpf documentation:
> "The mantissa is stored in binary. One consequence of this is that
> decimal fractions like 0.1 cannot be represented exactly"
> 
> And as I hinted to in my original message, mpq_set_str does not handle
> floating point strings (according to its manual).

0.1 is a notation that was used in math before floating point existed:
https://en.wikipedia.org/wiki/Decimal#History

IMHO, it would be worth to support it in mpq_set_str, independently
of the notion of floating point.

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