single
@NotNull
@CheckReturnValue
@NotNull
@CheckReturnValue
open fun <T : Operation.Data?> single( @NotNull call: ApolloCall<T>, @NotNull backpressureStrategy: BackpressureStrategy): Single<ApolloResponse<T>>
open fun <T : Operation.Data?> single(@NotNull call: ApolloCall<T>): Single<ApolloResponse<T>>