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int
sizeinbase_gmp(n, b)
...
  CODE:
    RETVAL = mpz_sizeinbase(*n, b);

sub Math::BigInt::sizeinbase_gmp {
    my $bigint = shift; # ?
...
    require Math::BaseCnv;
    return Math::BaseCnv::cnv( length($bigint)-1, 10, $base (;
}