More words on patch #837242, since 4 or 5 tests started

failing on one of the 32-bit buildbot boxes because of it,
due to tempting but always-wrong Python code.  Users
probably have code like this too (I know I did ...).

Misc/NEWS

@@ -12,9 +12,20 @@ What's New in Python 2.5 alpha 2?
 Core and builtins
 -----------------
 
-- Patch #837242: id() of any Python object always gives a positive
-  number, which might be a long integer. PyLong_FromVoidPtr and
-  PyLong_AsVoidPtr have been changed accordingly.
+- Patch #837242: ``id()`` of any Python object always gives a positive
+  number now, which might be a long integer. ``PyLong_FromVoidPtr`` and
+  ``PyLong_AsVoidPtr`` have been changed accordingly.  Note that it has
+  never been correct to implement a ``hash()`` method that returns the
+  ``id()`` of an object:
+
+      def __hash__(self):
+          return id(self)  # WRONG
+
+  because a hash result must be a (short) Python int but it was always
+  possible for ``id()`` to return a Python long.  However, because ``id()``
+  cuold return negative values before, on a 32-bit box an ``id()`` result
+  was always usable as a hash value before this patch.  That's no longer
+  necessarily so.
 
 - Python on OS X 10.3 and above now uses dlopen() (via dynload_shlib.c)
   to load extension modules and now provides the dl module. As a result,