Hello, I noticed that there are many places in Sage where x.__class__ is
used. In Cython code however, type(x) is much faster since Cython
optimizes type(x) but not x.__class__. The latter is simply compiled as
getattr(x, "__class__").
Usually, x.__class__ is the same as type(x), but it's the exceptions I'm
worried about. Especially in some places, x.__class__ is *assigned* to,
which cannot be done with type(x).
So my question is really: are there any easy-to-check conditions under
which it's certainly safe to change x.__class__ to type(x)?
At the very minimum, I would like to do this for __new__ calls, in code like
cdef type t = x.__class__
my_new_object = t.__new__(t)
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