[issue39573] Make PyObject an opaque structure in the limited C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Would a Py_TYPE_IS() macro help code readability?

For example:
    #define Future_CheckExact(obj) (Py_TYPE(obj) == &FutureType)
would become:
    #define Future_CheckExact(obj) (Py_TYPE_IS(obj, &FutureType))

Py_TYPE_IS() would be more efficient for tagged pointers.

I'm not sure about the macro name. Neil used Py_IS_TYPE(obj, type).

Note: Py_TYPE_EQ(obj, type) name sounds confusing since the first parameter is an object, whereas the second one is a type.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39573>
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