Yeah, preparser doesn't check duplicates in arrow function param lists, since when we start parsing the param list we don't yet know that it's a param list...
(this could maybe be solved with some speculative checking, idk).

I hadn't had time to look at this CL yet, arv@ probably will also have a look
since you also brought up this alternative to the lookahead increase.

https://codereview.chromium.org/997823003/

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