[heycam/webidl] Is -0 < 0, regarding [EnforceRange]? (#306)

[EnforceRange] will throw a TypeError

> If x < lowerBound or x > upperBound, then throw a TypeError.

If lowerBound is 0 and x is -0, will this throw? Note that `-0 < 0` is false in JavaScript.

The answer might be well-defined by ECMAScript conventions, but we should check that it is, and in any case we should add a note about this explicit case.

Note that the [Clamp] and no-extended-attribute cases don't have this problem as they explicitly censor -0 to 0. Although I guess clamp is a bit ambiguous, if "round -0 to the nearest integer choosing 0 instead of -0" will in fact change -0 to 0.

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