Re: [heycam/webidl] Add bigint type (#525)

Another way to handle both the union and overloading semantics could be to do something similar to what the JS spec does: Call ToNumeric in the ambiguous cases, and make the judgment based on whether a Number or BigInt falls out. This is what we do for most overloaded operators such as `-`. ToNumeric converts strings to Numbers--this is required, for compatibility. Presumably a similar compatibility risk (but perhaps not as serious, depending how much the method is used) would exist if there's an existing method which takes a numeric type and wants to add a bigint overload, or a bigint member to a union.

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