* Run exec tests in fresh contexts
* Reevaluate modules in every context
* Cache module code when running tests
* Eliminate weakmap accesses as much as possible
* Remove old multiline usage
* Using bundled polyfill to significantly increase performance
The individual requires for each file were the part that was sooooo slow.
* Drop LRU cache size
* Fixes
* Fix test
Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>
* 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
