'commit all attributes unconditionally.
This is used after a flush() or a full load/refresh
to remove all pending state from the instance.
- all attributes are marked as "committed"
- the "strong dirty reference" is removed
- the "modified" flag is set to False
- any "expired" markers/callables for attributes loaded are removed.
Attributes marked as "expired" can potentially remain
"expired" after this step if a value was not populated in state.dict.'

def _commit_all(self, dict_, instance_dict=None):

    self._commit_all_states([(self, dict_)], instance_dict)
