mpz_sizeinbase() bug

Wed Aug 19 00:21:51 UTC 2020

Dear GMP maintainers,

i found a possible bug in the mpz_sizeinbase() function. e.g.
mpz_sizeinbase(63, 10) returns 2
mpz_sizeinbase(64, 10) returns 3

Attached to this mail you can find a detailed report with all 
informations needed as described in 
https://gmplib.org/manual/Reporting-Bugs

Many thanks for maintaining this library!
best regards,
Johannes Lebender
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