Add a discussion section

pep-0428.txt

@@ -656,6 +656,42 @@ Several common filesystem operations are provided as methods: ``touch()``,
 provided, for example some of the functionality of the shutil module.
 
 
+Discussion
+==========
+
+Division operator
+-----------------
+
+The division operator came out first in a `poll`_ about the path joining
+operator.  Initial versions of `pathlib`_ used square brackets
+(i.e. ``__getitem__``) instead.
+
+.. _poll: https://mail.python.org/pipermail/python-ideas/2012-October/016544.html
+
+joinpath()
+----------
+
+The joinpath() method was initially called join(), but several people
+objected that it could be confused with str.join() which has different
+semantics.  Therefore it was renamed to joinpath().
+
+Case-sensitivity
+----------------
+
+Windows users consider filesystem paths to be case-insensitive and expect
+path objects to observe that characteristic, even though in some rare
+situations some foreign filesystem mounts may be case-sensitive under
+Windows.
+
+In the words of one commenter,
+
+    "If glob("\*.py") failed to find SETUP.PY on Windows, that would be a
+    usability disaster".
+
+    -- Paul Moore in
+    https://mail.python.org/pipermail/python-dev/2013-April/125254.html
+
+
 Copyright
 =========