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

[STINNER Victor]

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

> It seems to affect performance.

Oh ok. So this change makes .isocalendar() slower and breaks the backward compatibility on the serialization. I'm not longer sure that it's worth it.

I defer the decision the datetime module maintainers: Alexander Beloposky and Paul Ganssle.

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<https://bugs.python.org/issue24416>
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