Alex Lam S.L 24aa07855b safer properties transform (#2391) ...

`{ a: x, b: y }.a` => `[ x, y ][0]`
- `x` cannot be function containing `this`

`[ x, y, z ][1]` => `(x, z, y)`
- only if `z` is side-effect-free

2017-10-22 20:10:13 +08:00

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