[Webkit-unassigned] [Bug 221093] Support Ergonomic Brand Checks proposal (`#x in obj`)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221093

--- Comment #2 from Jordan Harband <ljharb at gmail.com> ---
test262 tests have landed: https://github.com/tc39/test262/pull/2963

it'd be great to see this implemented :-D

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