Define handling of multiple payload versions (e.g. after an endpoint has been updated) #49
Description
There are different cases where, for whatever reason, an endpoint wants to send data with different versions (layouts, etc.) at one time.
This can occur, e.g. when the endpoint is just updated, but not all old data has been sent yet. When it comes to transmission, it will be unclear whether the endpoint should send the data via old or new resource path.