Editorial: Add a non-promise version of "fully reading" a stream

[noamr]

This makes it easier for non-JS consumers of streams, like the Fetch specs, to use streams without a JS execution context.

See https://github.com/whatwg/fetch/issues/1568

• [ ] At least two implementers are interested (and none opposed):
  • …
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno: …
  • Node.js: …
• [ ] MDN issue is filed: …

(See WHATWG Working Mode: Changes for more details.)

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[ricea]

No problem for Chrome, we don't do "full reading" at the JavaScript layer anyway. I think you can call us "interested" because it clears up any possible difference between our implementation and the spec.

[noamr]

No problem for Chrome, we don't do "full reading" at the JavaScript layer anyway. I think you can call us "interested" because it clears up any possible difference between our implementation and the spec.

I think this is purely editorial anyway..