'Suggest a type for a \'coerced\' Python value in an expression.
By default, returns self.   This method is called by
the expression system when an object using this type is
on the left or right side of an expression against a plain Python
object which does not yet have a SQLAlchemy type assigned::
expr = table.c.somecolumn + 35
Where above, if ``somecolumn`` uses this type, this method will
be called with the value ``operator.add``
and ``35``.  The return value is whatever SQLAlchemy type should
be used for ``35`` for this particular operation.'

def coerce_compared_value(self, op, value):

    return self
