[issue24416] Have date.isocalendar() return a structseq instance

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> By contrast, returning a plain tuple from `isocalendar()` is the easier *and* more performant thing to do, and given that any benefits seem marginal I'm against the switch.

Does someone have benchmark numbers? If we go with structseq, creating a new instance should be almost as efficient as creating a tuple, no?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24416>
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