Is "use bignum;" an option? ---> 
use bignum;
use warnings;

$x = 2**54 + 123; # 18014398509482107
$y = 2**54 + 125; # 18014398509482109

if($x + 2 == $y) {print "fine\n"}
else {print "crap\n"}

if($x == $y) {print "crap\n"}
else {print "fine\n"}

--->
fine
fine

In reply to Re^2: -Duse64bitint and (Cygwin) perl 5.8.7 (it's not how many bits, but how you use them) by mersenne
in thread -Duse64bitint and (Cygwin) perl 5.8.7 by syphilis

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