PEP 509: add alternatives

pep-0509.txt

@@ -230,6 +230,23 @@ any overhead on dictionary operations.
 Alternatives
 ============
 
+Bikeshedding on the property name
+---------------------------------
+
+* ``__cache_token__``: name proposed by Nick Coghlan, name coming from
+  `abc.get_cache_token()
+  <https://docs.python.org/3/library/abc.html#abc.get_cache_token>`_.
+* ``__version__``
+* ``__timestamp__``
+
+
+Add a version but don't expose it at the Python level
+-----------------------------------------------------
+
+Guards can be implemented in C to access directly the ``ma_version``
+field of the ``PyDictObject`` structure.
+
+
 Add a version to each dict entry
 --------------------------------