TypedArray itemType property not set on Rx.amf call

[ximus]

[This the short rewrite of a ticket I wrote that got lost in Github's recent DB issue. Sorry I don't have time to regenerate the stacktrace and paste snippets.]

I make an Rx.amf call to the server and the server sends me a list of records back in AMF format. The AMF is well unmarchalled into a TypedArray but once AMFSercializer tries to get the cached ModelCollection from Rx.models.cache, it gets a null reference back because the neither the TypedArray's itemType property or the defaultType function arguments are set, thus it queries the cache with a null fqn.

Somewhere along the flow, wether on the server side or client side, the itemType property is not set. I think it should be on the server where the object originates.

[dima]

Thanks, I'll double check this issue for 1.3.1