Readonlycallback: AsyncDataHandler<T> | DataHandler<T>Optional Readonlyordered?: booleanWhen true, callback invocations are executed sequentially in data-arrival order, regardless of their async duration. Default: false (unordered, backward-compatible).
Configuration for AsyncSinkTransfer — sync or async callback invoked on each incoming data, with optional error handler, backpressure, and ordered execution.