gh-91768: C API no longer use "const PyObject*" type (#91769)

Py_REFCNT(), Py_TYPE(), Py_SIZE() and Py_IS_TYPE() functions argument
type is now "PyObject*", rather than "const PyObject*".

* Replace also "const PyObject*" with "PyObject*" in functions:

  * _Py_strhex_impl()
  * _Py_strhex_with_sep()
  * _Py_strhex_bytes_with_sep()

* Remove _PyObject_CAST_CONST() and _PyVarObject_CAST_CONST() macros.
* Py_IS_TYPE() can now use Py_TYPE() in its implementation.

1 files changed, 12 insertions, 7 deletions

diff --git a/Doc/c-api/structures.rst b/Doc/c-api/structures.rst
index aa74f6c..ff5ecf2 100644
--- a/Doc/c-api/structures.rst
+++ b/Doc/c-api/structures.rst
@@ -62,14 +62,14 @@ the definition of all other Python objects.
    See documentation of :c:type:`PyVarObject` above.
 
 
-.. c:function:: int Py_Is(const PyObject *x, const PyObject *y)
+.. c:function:: int Py_Is(PyObject *x, PyObject *y)
 
    Test if the *x* object is the *y* object, the same as ``x is y`` in Python.
 
    .. versionadded:: 3.10
 
 
-.. c:function:: int Py_IsNone(const PyObject *x)
+.. c:function:: int Py_IsNone(PyObject *x)
 
    Test if an object is the ``None`` singleton,
    the same as ``x is None`` in Python.
@@ -77,7 +77,7 @@ the definition of all other Python objects.
    .. versionadded:: 3.10
 
 
-.. c:function:: int Py_IsTrue(const PyObject *x)
+.. c:function:: int Py_IsTrue(PyObject *x)
 
    Test if an object is the ``True`` singleton,
    the same as ``x is True`` in Python.
@@ -85,7 +85,7 @@ the definition of all other Python objects.
    .. versionadded:: 3.10
 
 
-.. c:function:: int Py_IsFalse(const PyObject *x)
+.. c:function:: int Py_IsFalse(PyObject *x)
 
    Test if an object is the ``False`` singleton,
    the same as ``x is False`` in Python.
@@ -93,7 +93,7 @@ the definition of all other Python objects.
    .. versionadded:: 3.10
 
 
-.. c:function:: PyTypeObject* Py_TYPE(const PyObject *o)
+.. c:function:: PyTypeObject* Py_TYPE(PyObject *o)
 
    Get the type of the Python object *o*.
 
@@ -103,6 +103,7 @@ the definition of all other Python objects.
 
    .. versionchanged:: 3.11
       :c:func:`Py_TYPE()` is changed to an inline static function.
+      The parameter type is no longer :c:type:`const PyObject*`.
 
 
 .. c:function:: int Py_IS_TYPE(PyObject *o, PyTypeObject *type)
@@ -120,12 +121,15 @@ the definition of all other Python objects.
    .. versionadded:: 3.9
 
 
-.. c:function:: Py_ssize_t Py_REFCNT(const PyObject *o)
+.. c:function:: Py_ssize_t Py_REFCNT(PyObject *o)
 
    Get the reference count of the Python object *o*.
 
    Use the :c:func:`Py_SET_REFCNT()` function to set an object reference count.
 
+   .. versionchanged:: 3.11
+      The parameter type is no longer :c:type:`const PyObject*`.
+
    .. versionchanged:: 3.10
       :c:func:`Py_REFCNT()` is changed to the inline static function.
 
@@ -137,7 +141,7 @@ the definition of all other Python objects.
    .. versionadded:: 3.9
 
 
-.. c:function:: Py_ssize_t Py_SIZE(const PyVarObject *o)
+.. c:function:: Py_ssize_t Py_SIZE(PyVarObject *o)
 
    Get the size of the Python object *o*.
 
@@ -145,6 +149,7 @@ the definition of all other Python objects.
 
    .. versionchanged:: 3.11
       :c:func:`Py_SIZE()` is changed to an inline static function.
+      The parameter type is no longer :c:type:`const PyVarObject*`.
 
 
 .. c:function:: void Py_SET_SIZE(PyVarObject *o, Py_ssize_t size)