It seems FETCHSIZE is only called once, but each element is fetched right before the iteration:

That's correct. for (@a) iterates over the indexes as if you had done for (0..$#a). This differs from for ((), @a), which retrieves the contents of @a up front.

In reply to Re^4: Getting for() to accept a tied array in one statement by ikegami
in thread Getting for() to accept a tied array in one statement by perlancar

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