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I was reading a tutorial on Perl autovivification and came across this bit of code, testing whether a number was a valid array index:

return unless 0 <= $key && $key < @{$ref} ;

And I thought “meh”, because the author used @{$ref} in a comparison for a valid index.

I would have used && $key <= $#{$ref} (well, actually probably $#$ref) instead.

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