Before SymPy@2.0, such as SymPy@1.2.1, simple arithmetic functions are type stable, e.g.,  However, for SymPy@2.0.1,  It seems that the `Base.promote` function cannot work as expected.
Before SymPy@2.0, such as SymPy@1.2.1, simple arithmetic functions are type stable, e.g.,
However, for SymPy@2.0.1,
It seems that the
Base.promotefunction cannot work as expected.