BUG: Fix reference count leak in ufunc dtype handling #19349
Merged
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Backport of #19289.
This adds a missing decref to the signature/dtype keyword argument
logic in reductions.
(The code will change quite a bit after 1.21, but this avoids a
reference count leak on 1.21.)
EDIT: It may take until tonight for me to know whether there is much (or anything) more coming...