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$ python3 -c "print (2 ** 0.5)"
1.4142135623730951
...

$ perl -le "print 2 ** 0.5;"
1.4142135623731

$ rakudo -e "say (5.3130431399669280e-34)"
5.3130431399669284e-34

$ python3 -c "print (5.3130431399669280e-34)"
5.313043139966928e-34

$ perl -le "print 5.3130431399669280e-34;"
5.31304313996693e-34