In my experience, it seems like the vast majority of the time in which that would be the case, one isn't doing a native ("binary") object serialization such as

In my experience, it seems like the vast majority of the time in which that would be the case, one isn't doing a native ("binary") object serialization such as would require the receiver to have the object code for the serialized class(es), but instead using some sort of intermediate format like JSON or XML or the like. But I suppose there might be instances... I just hate to throw away such a fundamental OOP concept as bundling of data and the methods that operate on that data unless there's a really good reason.