Make nested content test fail by introducing objects that don't get converted to immutable yet.
Make nested content test fail by introducing objects that don't get converted to immutable yet.

rtfeldman/seamless-immutable,crudh/seamless-immutable,virajsanghvi/seamless-immutable,SamHowie/seamless-immutable,jedwards1211/seamless-immutable,oliverwoodings/seamless-immutable