Per-read options, accepted by every RangeReader and threaded through the reader down to the actual transport call.
Optional
Best-effort cancellation. An already-aborted signal is honoured before any work happens; an in-memory source cannot usefully abort mid-read because there is no "mid" -- the read is synchronous under the hood.
Per-read options, accepted by every RangeReader and threaded through the reader down to the actual transport call.