lol, the internal docs on this at Amazon were something very close to "we invented this before Avro and we think that's probably a better choice if you need binary serialization."
My 2 cents: don't use it.
My 2 cents: don't use it.
Honestly, if you’re in a case where you absolutely know none of these work for you and you can absolutely prove you need another, you’re probably just going to write your own. And that’s a fleetingly rare case.