isKotlinCollection && typeArguments.single().isJavaClass


private
fun candidatesForExtensionFrom(type: ApiType): Sequence<ApiFunction> =
    type.functions.filter(::isCandidateForExtension).asSequence()


private
fun Sequence<ApiFunction>.sortedWithTypeOfTakingFunctionsFirst() =
    sortedBy { f ->
        if (f.parameters.any { it.type.isGradleTypeOf }) 0
        else 1
    }