This is now an official project and will be eventually improved over there.
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July 11, 2018 10:31
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An attempt to polyfill Symbol for ES5 compatible engines
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I think if
getOwnPropertySymbols
is there we have to assume somebody else either patched upfront or the browser must supportSymbol
natively. I don't see how that check can improve a sham, since we risk to overwrite other attempts that might be there and work as intended for reasons.TL;DR I wouldn't go for that check, it's prolix for no advantages.