If the OP were to persist in prematurely optimizing, of course, the only thing you could meaningfully optimize this code for would be the number of bytes of code, in which case the naive solution for the critical section would be
$\ = $/;
print foreach (@numbers);
Though at that point, we've opened the door into whole new realms of time-wasting. ;-)
If God had meant us to fly, he would *never* have given us the railroads.
--Michael Flanders
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