Readonlyflow: AsyncInputFlowInterface<T> | InputFlowInterface<T>Optional Readonlyordered?: booleanWhen true, flow.write() invocations are executed sequentially in data-arrival order, regardless of their async duration. Default: false (unordered, backward-compatible).
Configuration for AsyncWriteTransfer — async or sync target flow with write(), optional error handler, backpressure, and ordered execution.