huh? can you elaborate? `for (var key in {a:1,__proto__:null}) console.log(key)` only prints `a`, as expected
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even with extra properties on Object.prototype
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Chrome actually uses that internally - there is some semi-trusted code running under the same global scope as user code
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execute "chrome.runtime" in chrome devtools, then look in sources view under "(no domain)"
7:30 AM - 17 Oct 2016
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