After cleaning up some code related to homsets in #23905, I noticed that
the new code was about 20% to 30% slower in some cases. I traced this
difference to a call
R = parent(x)
where x was a Python function (so, not a Sage Element).
It turns out that parent(x) tries to call x.parent(). If that fails,
then type(x) is returned. If I change the code of parent() to always
return type(x) for non-Elements, the slowdown on #23905 goes away.
So the question is: should parent(x) call x.parent() for non-Elements?
See Trac #23912.
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