A modern programming language that makes developers happier.

kotlinlang

i am trying to consume a protobuf API over json and it uses `oneof` extensively.  i originally built my data objects as just normal data classes with nullable fields representing the various oneof field options, but I’d really like to represent this with a sealed class.  I started writing a custom decoder but I can’t figure out how to essentially “peek” and see which field is present so I know which serializer to use.  anybody done this successfully?

<https://github.com/edenman/kmpPlayground/compare/edenman/sealed-serializer-without-type#diff-819a26e7b90a4189335ef52a05046708R24> if you want to look at my code

the “try deserializing each of the sealed class implementations” approach doesn’t work, calling `decode` apparently moves the index and thus subsequent calls for the other types fail

ok so this looks like what i want <https://github.com/Kotlin/kotlinx.serialization/blob/master/runtime/commonMain/src/kotlinx/serialization/json/JsonInput.kt#L28>

except there doesn’t seem to be a  `decodeJson` method anymore

<https://github.com/Kotlin/kotlinx.serialization/pull/855>