Optional reason: anyOptional metaProvides a convenient, chainable way of piping this readable stream through a transform stream (or any other { writable, readable } pair). It simply pipes the stream into the writable side of the supplied pair, and returns the readable side for further use.
Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.
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This interface extends the
ReadableWritablePairwith a method to cancel the connection. It also includes some optional generic metadata. This is mainly used as the return type for theStreamFactory. But the interface can be propagated across the RPC system.