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The new "Futures API" refers to an "AlreadyResolved" exception. However, this error name is not listed in http://dom.spec.whatwg.org/#error-names-0.
Yeah, also does not match the naming convention. Also, it's been suggested we should not throw at all here.
https://github.com/whatwg/dom/commit/aadbcfa92a311f701aaeab12356f40e29fde0195