I do plan to do this after the next release. There are some details to
work through in making something that works for all of Basic.
The Function model with eval works well but I'm not sure that it would
work for everything else. I think that we need to move the logic that
is currently in __new__
This is related to the discussion here
https://github.com/sympy/sympy/issues/17280.
I like the idea. The implementation of __new__ is often quite
confusing, and it isn't always clear if you are doing it correctly.
That's not to mention that most people aren't used to using __new__ in
Python. We
