Re: [whatwg/streams] Provide a way for the underlying sink to signal write progress? (#876)

Two additional alternative approaches

1. Create and use a `CustomEvent` with type set to `"progress"`, dispatch the event with `bytesSoFar` and `resolve` argument of `Promise` executor set at `detail` property of `.dispatchEvent()`; which provides a means to halt further write (or read) until the `Promise` is fulfilled;
2. For remote connections under the developers control, `EventSource` can be used as a persistent streaming connection (until closed) to get the bytes received at or sent from the remote connection.

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