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use warnings;
use Math::GMPz qw(:mpz);
$num = 144115188075868217;# this is an IV
$obj = Math::GMPz->new($num);

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use warnings;
use Math::GMPz qw(:mpz);
$num = 2 ** 57 + 12345;# this is an NV
$obj = Math::GMPz->new($num);