'Return the current pre-flush change history for
this attribute, via the :class:`.History` interface.
This method will **not** emit loader callables if the value of the
attribute is unloaded.
.. seealso::
:meth:`.AttributeState.load_history` - retrieve history
using loader callables if the value is not locally present.
:func:`.attributes.get_history` - underlying function'

@property
def history(self):

    return self.state.get_history(self.key, PASSIVE_NO_INITIALIZE)
