>> Can you explain the rationale for dropping the use of '_marker' in
>> favor of 'None'?
> As far as I can remember some tests in ZODB explicitly pass (None, None)
> when iterating over the whole structure, bit I will give it a better
> look later.

OK, for instance:

     def iterator(self, start=None, end=None):
         for transaction_record in self._transactions.values(start, end):
             yield transaction_record

which ultimately takes us to:

     def _range(self, min=_marker, max=_marker,
                excludemin=False, excludemax=False):
         if min is _marker:
             start = 0
             if excludemin:
                 start = 1
     # ...

somewhere along the way `None` should be translated to `_marker`, but 
that currently doesn't happen, which causes some of the tests to fail.


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