Waddayaknow! And I've even found a use for it:

print map ${ \( ++$i ) } %= 10, 1..30;;
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
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Now all we've gotta do is document it, and we've a valid reason for it working that way: measuring golf games. Perfect :)