- Only sync the metadata set when needed for sending
- Don't use metadata set for storing data, add properties instead
- Use objects inside metadata sets instead of arrays
these were slated for removal some time ago, but it never happened because they were used in the API. This is no longer the case on 4.0, so these classes are now entirely useless.
Did you guys think ALPHA7 changes were done?!
Sone stuff still needs some work, most notably data-properties can't be typed yet because they are just mushed into a couple of methods.