bpo-42528: Improve the docs of most Py*_Check{,Exact} API calls (GH-23602)
I think that none of these API calls can fail, but only few of them are
documented as such. Add the sentence "This function always succeeds" (which is
the same already used e.g. by PyNumber_Check) to all of them.diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index b7f99d3..1851c64 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -91,13 +91,13 @@
.. c:function:: int PyUnicode_Check(PyObject *o)
Return true if the object *o* is a Unicode object or an instance of a Unicode
- subtype.
+ subtype. This function always succeeds.
.. c:function:: int PyUnicode_CheckExact(PyObject *o)
Return true if the object *o* is a Unicode object, but not an instance of a
- subtype.
+ subtype. This function always succeeds.
.. c:function:: int PyUnicode_READY(PyObject *o)