calling modify()

[stevenao]

When i try to call myitem.object.first.modify(), and in the serialized json, i will get something like "Article:http://www.w3.org/ns/activitystreams#Object". That doesn't seem right to me.

I see it is coming from the _object.js constructor: https://github.com/jasnell/activitystrea.ms/blob/master/src/models/_object.js#L123. Do we need to append the as.Object type when there is types defined already?

[jasnell]

I know it's been a while, but, can you provide a test case I can use to reproduce