Whaaaaaat. This can't work under strict.

I forgot (now corrected; thanks) to copy-paste the declaration of the 3 arrays. my( @rindex, @eindex, @oindex );

It is there in my benchmark, but was common code used by 4 different paths through the code that tested different optimisations.

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In reply to Re^4: How to perform different sorts on multiple sections of items in the same array (optimised) by BrowserUk
in thread How to perform different sorts on multiple sections of items in the same array by estreb

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