bpo-40792: Make the result of PyNumber_Index() always having exact type int. (GH-20443)

Previously, the result could have been an instance of a subclass of int.

Also revert bpo-26202 and make attributes start, stop and step of the range
object having exact type int.

Add private function _PyNumber_Index() which preserves the old behavior
of PyNumber_Index() for performance to use it in the conversion functions
like PyLong_AsLong().

1 files changed, 1 insertions, 1 deletions

diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
index 0f40e0679f0..b1bf7826ebf 100755
--- a/Tools/clinic/clinic.py
+++ b/Tools/clinic/clinic.py
@@ -3062,7 +3062,7 @@ class Py_ssize_t_converter(CConverter):
             return """
                 {{{{
                     Py_ssize_t ival = -1;
-                    PyObject *iobj = PyNumber_Index({argname});
+                    PyObject *iobj = _PyNumber_Index({argname});
                     if (iobj != NULL) {{{{
                         ival = PyLong_AsSsize_t(iobj);
                         Py_DECREF(iobj);