For example, a search for Py_TPFLAGS says it's all “Python data”:

Same with METH_.

I guess this should be changed to c:macro:. It doesn't change URLs, but it would break references and Intersphinx links in third-party docs.
And there's a lot of references to these items that use :const: rather than :c:macro:. All of them would need to change, possibly causing conflicts in backports.

An additional issue is flag combinations in structures.rst:

.. data:: METH_VARARGS

   This is the typical calling convention, where[...]


.. data:: METH_VARARGS | METH_KEYWORDS

   Methods with these flags must [...]

These should look like items of the same category to the reader, but one is a valid c:macro and the other isn't.

Sphinx experts, any tips on how (and whether) to best fix this?