++.
You can eliminate reverse and shorten it to 55.
sub luhn {
# 1 2 3 4 5
#234567890123456789012345678901234567890123456789012345
my$s;$_=pop;~s/(.)(.)/$2.$1*2/ge;$s+=$_ for/./g;!chop$s
}
and, if you don't care for strict-ness, shave
another 5 chars, by eliminating my$s;
/prakash
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