In sage/covariant_functorial_construction.py, line 359 we still have
an uncached
def is_subcategory(self, C):
"""
.. todo:: doctests + explain why this method is needed
"""
if C is self:
return True
return any(X.is_subcategory(C) for X in
self._super_categories)
which caused much of the problems observed on #13400. It was found on
that ticket that the routine can simply be deleted, because there's a
better implementation somewhere further up the inheritance tree. Since
#13400 doesn't seem to be going anywhere soon, perhaps another ticket
can accept this deletion as a rider patch?
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