I see that Scio fallsback to Kryo coder rather than Java Serializer which is default coder used for Dataflow when coder cannot be inferred/found via CoderRegistry. I don't see any reference to setFallbackCoderProvider anywhere, how does Scio registers the fallback to KryoAtomicCoder?
How does Scio fallback to Kryo
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Up to Scio v0.6.x it happens here: https://github.com/spotify/scio/blob/v0.6.1/scio-core/src/main/scala/com/spotify/scio/Implicits.scala#L55
Coder lookup and derivation has changed significantly since v0.7.x. It's still under heavy development but for more details see: https://github.com/spotify/scio/wiki/Coders