Re: [heycam/webidl] Disallow -0 in algorithm for checking array index (#517)

With a note saying that it's supposed to be equivalent to https://tc39.github.io/ecma262/#array-index anything would do, but using just the ≤ operator in the normative definition seems wrong. Whether operating on IEEE doubles or real numbers, positive zero equals negative zero. So it's not possible to write that expression out as-is in code or in mathematics and have -0  not be in the range.

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