Ron Buckton a0c44b26b7
Improve __spreadArray perf, and other fixes related to SpreadElement (#44527)
* Improve __spreadArray perf, fix array packing and trailing omitted expressions

* Ensure __spreadArray is backwards-compatible

* Add signature restriction for __spreadArray

* Added reusable true/false literals
2021-06-11 16:21:55 -07:00
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