code: def unwrap(self, value, session=None):
          ''' Validates ``value`` and unwraps it with ``ComputedField.computed_type``'''
          self.validate_unwrap(value)
          return self.computed_type.unwrap(value, session=sessionf unwrap(self, value, session=None):
          ''' Validates ``value`` and unwraps it with ``ComputedField.computed_type``'''
          self.validate_unwrap(value)
          return self.computed_type.unwrap(value, session=session)
docs: Validates ``value`` and unwraps it with ``ComputedField.computed_type``