[whatwg/streams] Use `mark as handled` Web IDL phrase instead of using `PromiseIsHandled` internal slot directly (Issue #1373)

saschanaz created an issue (whatwg/streams#1373)

### What is the issue with the Streams Standard?

https://github.com/whatwg/webidl/pull/1090 added it with an example of Streams, yet the Streams spec hasn't been updated with it.

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Received on Monday, 4 May 2026 09:08:40 UTC