-spec init() -> ok.

-spec node() -> {ok, atom()} | {error, marina_pool_not_started}.

-spec node(binary() | undefined) -> {ok, atom()} | {error, marina_pool_not_started}.

-spec node_id(binary()) -> atom().

-spec start(random | token_aware, [{binary(), binary()}]) -> ok.

-spec stop(non_neg_integer()) -> ok.

-spec sync(random | token_aware, [{binary(), binary()}], [{binary(), binary()}]) -> ok.