Transform the MongoDB value into a Marrow Mongo value.

def to_native(self, obj, name, value):  # pylint:disable=unused-argument
		"""Transform the MongoDB value into a Marrow Mongo value."""
		
		if self.mapping:
			for original, new in self.mapping.items():
				value = value.replace(original, new)
		
		return load(value, self.namespace)