github/Mantle — pull request #49 by pizthewiz (2012-11-21 04:09:33+00:00)
Title: Add method to specify desired property keys in external representation

Resolves #48

the added```-[MTLModel externalRepresentationForPropertyKeys:]``` allows one to be more selective in the data that is serialized.

an argument could be made that a similar mechanism is needed for archiving (ignore anything that can be regenerated), and perhaps something much more comprehensive is needed, but this change matched an immediate need i had and perhaps might fit @matzew too.