listOf(targetType.sourceName, name) +
        parameters.flatMap { apiTypeKey(it.type) }
}


private
fun apiTypeKey(usage: ApiTypeUsage): List<Any> = usage.run {
    listOf(sourceName, isNullable, isRaw, variance) +
        typeArguments.flatMap(::apiTypeKey) +
        bounds.flatMap(::apiTypeKey)
}


// TODO Policy for extensions with reified generics
//
// Goals