#1653736 reports that slot_nb_inplace_power has the wrong
type: it should be a ternary function, but only is a binary.
The proposed change is to make it ternary, and to invoke __ipow__
with three arguments.
In researching this, I came to wonder why nb_inplace_power is
ternary in the first place. It is the implementation of
foo **= bar
(and that's its only use), so it ought to be binary. Historically,
the reason probably is that it was copied from nb_power, which is
ternary because it also implements pow()).
So here is my proposed change:
1. For 2.5.1, rewrite slot_nb_inplace_power to raise an exception
if the third argument is not None, and then invoke __ipow__
with only one argument.
2. For 2.6, change the API to make nb_inplace_power binary.
Optionally, in 2.5, the exception could be added into other places
as well, e.g. PyNumber_InPlacePower and instance_ipow (rather than
invoking __ipow__ with a third argument if its not None).
Comments?
Regards,
Martin
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