This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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It doesn't seem to exist in the test (or the IDL) any more.

URL has a toJSON() method which is missing from our implementation. Do you want to repurpose this bug for that?

The definition of URL toJSON() is here:

https://url.spec.whatwg.org/#dom-url-tojson

It appears to be equivalent to JSON.stringify(this.href).