Implementation commitments for transferable data channels

[dontcallmedom]

Transferable data channels seems to have reasonable test coverage and one passing implementation.

Relevant Chromium bug report, Firefox bug report ; @alvestrand @jan-ivar can you comment whether these indicate something akin to an implementation commitment? (in which case that feature could migrate to the main spec)

[Orphis]

Chromium has landed code to support transferable data channels behind a runtime flag and will be working on launching the feature to stable.

[tguilbert-google]

Note that Chromium only supports transfers to DedicatedWorkers, whereas Safari also supports transfers to ServiceWorkers.

This is projected to be turned on by default starting in M130.

Should we consider moving the extension text back into the main spec? [Edit:] I opened an issue to track this discussion.