Re: [whatwg/streams] Add piping helpers for other specs (#1113)

@domenic commented on this pull request.



> + {{Promise}} that fulfills when the pipe completes, or rejects with an exception if it fails.
+
+ 1. Assert: ! [$IsReadableStreamLocked$](|readable|) is false.
+ 1. Assert: ! [$IsWritableStreamLocked$](|writable|) is false.
+ 1. Let |signalArg| be |signal| if |signal| was given, or undefined otherwise.
+ 1. Return ! [$ReadableStreamPipeTo$](|readable|, |writable|, |preventClose|, |preventAbort|,
+    |preventCancel|, |signalArg|).
+
+ <p class="note">If one doesn't care about the promise returned, referencing this concept can be a
+ bit awkward. The best we can suggest is "[=ReadableStream/pipe=] <var ignore>readable</var> to <var
+ ignore>writable</var>".</p>
+</div>
+
+<div algorithm="ReadableStream pipe through">
+ The result of a {{ReadableStream}} |readable| <dfn export for="ReadableStream" lt="pipe
+ through|piping through">piped through</dfn> a {{TransformStream}} |transform|, given an optional

The latter would require doing JavaScript-observable Get()s, which introduces the possibility of sync exceptions. I think we should leave it as just `TransformStream` for now unless some spec comes along that needs the generic concept.

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