Nathan Shively-Sanders 8d24712d85 Improve __assign emit:remove getOwnPropertySymbols
Since __assign defaults to Object.assign if present, our own helper will
never be used in ES6 and higher, and `getOwnPropertySymbols` is not
needed in ES5 and below because symbols don't exist there.
2016-11-16 10:14:16 -08:00
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