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$ perl -V:ivsize          4: -2**(4*8-1) .. 2**(4*8-1)-1
ivsize='4';               8: -2**(8*8-1) .. 2**(8*8-1)-1
...

$ perl -V:nvsize          8:  double, 53 bits of precision
nvsize='8';               16: quad,  113 bits of precision