JSON but as a behavior for flexible per instance data.
I'm glad it's useful, let me know if I introduced any bugs while porting.
That's weird, I would have expected it would prompt users to update automatically. Not sure if that is a bug or not, it may be worth it to investigate further and report it to Scirra.
I am planning to port all of the DATA+ addons, but it is not a priority for me rn, so it may take a bit.