RKAttributeMapping lose custom value transformer when RKObjectMapping is inverted

In RKObjectMapping
On invertMapping:withPredicate:

Each mapping.attributeMappings is recreated with source/destination keyPaths inverted but its propertyValueClass and valueTransformer are not copied from original attributeMapping

Solution:
Implemented and used a new copyPropertiesFromMapping: method for RKAttributeMapping in the same way it already was for RKObjectMapping
I've changed my code in the right way (setting the property value class in the right mapping without inverting it) so I can close the pull request cause losing the property value class it's right as design and transformer can be set on the default transformers list.
I'm right?