Anatoli Papirovski aefbb1380e No unneeded empty arrays in transform spread (#6763)
* No unneeded empty arrays in transform spread

Since Array.prototype.concat creates a new array from inputs, there's
no need to call it from a new empty array ([].concat()).

* [fixup] simplify detection of new array
2017-11-09 14:51:56 -05:00
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