The difference is certainly *measurable*....

Not really. That's what "too few iterations" means. It's barely even significant either, as the difference between those two pieces of code is the addition of two stack-manipulating macros in the former case. You're doing about the same amount of work in both, so my guess is that there's another factor in your benchmark that more testing would expose.

In reply to Re^3: Return array or list from an XSUB? by chromatic
in thread Return array or list from an XSUB? by smee30

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