Whitespace after minus sign in mpz_set_str

[Vincent Lefevre]

On 2023-05-07 15:37:12 +0200, Fredrik Johansson wrote:
> However, mpz_set_str returns that the string is invalid when a space
> appears between the minus sign and the first digit. For example,
> 
>     mpz_set_str(x, "- 123", 10)
> 
> does not work.

According to the GMP code (mpz/set_str.c), whitespace in the prefixes
0x/0X/0b/0B is not handled either.

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