>> 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):
which ultimately takes us to:
def _range(self, min=_marker, max=_marker,
if min is _marker:
start = 0
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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