New namespace avoid name clash with existing math's stuff

Author: skirpichev

peps/pep-0791.rst

@@ -97,6 +97,13 @@ and issue `python/cpython#81313
 * ``fibonacci()`` --- `Fibonacci sequence
   <https://en.wikipedia.org/wiki/Fibonacci_sequence>`_.
 
+Separated namespace eliminates possible name clash with existing
+:external+py3.14:mod:`math`'s module functions.  For example, possible names
+``ceil_div()`` or ``ceildiv()`` for integer ceiling division will interfere
+with the :external+py3.14:func:`~math.ceil` (which is for :class:`float`'s and
+*sometimes* does right things for integer division, as an accident --- but
+`usually not <https://discuss.python.org/t/91269/6>`_).
+
 
 Rationale
 =========