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jbroman authored
It's easy to get this wrong and use Set instead, which can invoke author script in unexpected places. This is a convenient helper that does the right thing, similar to blink::V8ObjectBuilder. A unit test and two "real-world" uses are included. BUG= Review-Url: https://codereview.chromium.org/2845463002 Cr-Commit-Position: refs/heads/master@{#467711}
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