so with 0.9.0 i cannot longer just rely on implicit reflection and use

JSON.stringify(something)

for now i solved it like this

data class Something(
    val someProperty: String
) {
    @Serializer(forClass=Something::class)
    companion object
}

JSON.parse(Something, string)

is there a better way than adding companion objects to everything ?

Is

JSON.parse(Something.serializer(), string)

working for you? Underlying mechanisms for implicit serializers were not changed, experimental annotation was added to emphasise consequences of theirs usage

yes it works but then i have to annotate the method, then all methods using that and eventuallz i might as well enable it globally and get no benefit from the annotation

you can use non-propagating annotation

@UseExperimental

what i'd like to see is that

@Serializable

automaticallz adds Serializer to the companion object if it does not exist

Yes, it does.

@Serializable

adds a companion object and function

.serializer()

on it to retrieve serializer

nice to know.. i already converted all my code to not use ImplicitReflection