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

[Dong-hee Na]

Dong-hee Na <donghee.na92 at gmail.com> added the comment:

@vstinner

Here is the new benchmark with you suggested.
It seems to affect performance.

== Baseline == 
Mean +- std dev: 134 ns +- 2 ns

== PR 15633 ==
Mean +- std dev: 174 ns +- 5 ns

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