Why can’t

io.ktor.client.features.json.JsonSerializer.read(..)

return the nullable

Any?

and why can’t the

write

function accept

Any?

? Is this just how they were designed, or is there an actual implementation constraint?

are you talking about, like, if the body is invalid?

You might want to map an empty body to null.

as I understand it, kotlinx.serialization supports serialization for nullable fields, but I don’t see how that pertains to the JsonSerializer read/write methods

Fair enough. The reason I even ask the question is because the prototype from kotlinx.serializaiton is

Json.parse(KSerializer<T>, String): T

, but because

serializer(KType)

returns a

KSerializer<Any?>

the built-in Json Serializer has to use the

!!

operator. I guess this is kinda an esoteric discussion.