[Python-ideas] Backward-incompatible changes for Python 4

[Jorropo .]

> It's much simpler to rename April 1 to February 29.
That will create a gap of one 1 day beetween shity regular callendar and
our new one for 2 month.

An algorithm distributing leap seconds near 1 first april, is maybe more
complicated but reduce side effect with the world.
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