Re: [whatwg/streams] pipeTo: Read fulfilled after shutdown started (Issue #1207)

> Would it also work to check if dest.[[state]] is "errored" before doing any reads from source?

I think that might work, yes. Sounds doable. 👍 

> It's unfortunate that both that solution (if it works) and the error callbacks one would make pipeTo unimplementable using public APIs. It was always a nice story that pipeTo was a higher-level combinator and the fundamental reader/writer APIs had just as much power. But maybe we have already crossed that bridge; I'm not sure...

You can still get 99% of the way there with only the reader and writer APIs. It's just that for that final 1%, you need the ability to *synchronously* read the stream's state, which is currently not possible with just those public APIs. (And believe me, I tried! See exhibit [1](https://github.com/MattiasBuelens/web-streams-polyfill/pull/99) and [2](https://github.com/MattiasBuelens/web-streams-polyfill/pull/106). 😅)

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