AFAIK for( @f ) is optimized to act like an iterator without expanding and caching the list.

But in for(reverse @f ) there is no for-context which helps reverse to act differently.

I'm to lazy for benchmarks (we had them before), but this was surely not fixed in 5.8.8

Cheers Rolf

In reply to Re^3: counting backward (optimize foreach reverse low .. high by LanX
in thread counting backward by ag4ve

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