can.Observe makes can.Deferred into an observable

[daffl]

The current implementation of canMakeObserve is:

canMakeObserve = function( obj ) {
  return obj && (can.isArray(obj) || can.isPlainObject( obj ) || ( obj instanceof can.Observe ));
}

As can.isPlainObject returns true for a can.Deferred, a promise that is part of a model's raw data values will be treated as a plain object to be wrapped as a child can.Observe with observable members itself. This is almost certainly not the intention.

[daffl]

True, that should not be converted. We'll fix it in the next release.

[daffl]

What actually would be really cool is if can.Observe realizes it is a Deferred, waits for it to complete and then sets the attribute with the result data. Not sure if that always applies though.

[justinbmeyer]

@daffl It shouldn't be converted, but it also shouldn't replace itself, but that's why I want: #366.