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kotlinlang

Hi, does anyone know why kotlin's `lazy` implementations all extend `Serializable`?

To be able to use lazy delegated properties in other serializable classes.

Are you aware of anyone using it? If yes, in which type of project?

actually we use kryo but it can understand how to use classes marked as serializable

How does kryo fair when it comes to backwards compatibility vs something like protobuf

It has a "compatibility serialiser" but we're replacing Kryo with our own wire format for long term storage. It has worked great during the prototyping stage though. It's got good features and a decent API.