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JavaScript ES7

Occasionally people will save a few bytes by replacing Math.pow with the exponentiation operator **, which is one of the few things that has already been standardised for ES7. As such, if you don't have ES7 handy, you could attempt to replace occurrences of ** with the equivalent Math.pow construct for testing purposes.

Currently the simplest way I know of getting an ES7 environment is to use a Nightly build of Firefox.