Pending removal in Python 3.20
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* The "cval" field in "PyComplexObject" (gh-128813). Use
  "PyComplex_AsCComplex()" and "PyComplex_FromCComplex()" to convert a
  Python complex number to/from the C "Py_complex" representation.

* Macros "Py_MATH_PIl" and "Py_MATH_El".
