Your right. I had it coded as a while loop

    $i++ while   ( $i < @$a and  $i < @$b )
     and not  $o=( $a->[$i] cmp  $b->[$i] );
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but decided as I was posting it, that it was better done as an until loop as the conditional was slightly clearer.

Unfortuantely, for the second time yesterday in the same thread I screwed up the conversion.

..and remember there are a lot of things monks are supposed to be but lazy is not one of them