Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

@domenic commented on this pull request.



> +
+ 1. Perform [$PackAndPostMessage$](|port|, `"error"`, |error|), discarding the result.
+
+ <p class="note">As we are already in an errored state when this abstract operation is performed, we
+ cannot handle further errors, so we just discard them.</p>
+
+</div>
+
+<div algorithm>
+ <dfn abstract-op lt="SetUpCrossRealmTransformReadable">SetUpCrossRealmTransformReadable(|stream|,
+ |port|)</dfn> performs the following steps:
+
+ 1. Perform ! [$InitializeReadableStream$](|stream|).
+ 1. Let |controller| be a [=new=] {{ReadableStreamDefaultController}}.
+ 1. Let |backpressurePromise| be [=a new promise=].
+ 1. Add a handler for |port|'s {{MessagePort/message}} event with the following steps:

Yeah. To be clear I don't suggest you change anything here, but I'd like to get us better primitives.

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