TYP: fix datetime64 unit conversion - #31883
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datetime64 unit swappingdatetime64 unit conversion
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The documented approach to convering the unit of a
np.datetime64is by passing it to the constructor together with the desired new unit, e.g.np.datetime64(my_dt, "s").The stubs incorrectly rejected this use-case; so here's the fix.
Fully written by me (a human, I think); bug found by Claude Fable 5 (high) (here's the full audit for those interested).