Serialization Options
I would like to know if you plan to implement a feature to serialize object depends on group context with exclusion strategy, options to handle serialization versionning, and so on ...
Something like this: http://jmsyst.com/libs/serializer/master/cookbook/exclusion_strategies#creating-different-views-of-your-objects
I don't think the scope will go beyond the standard library.
+1, we always want to maintain the "drop-in"-ness for the core of ffjson -- I'd be OK long run having an explicit ffjson-extensions module maybe, but the default experience has to be makes standard JSON faster -- without side effects or changes in behavior.