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

Oh, and unlike a lot of overload scenarios, the "overload numeric and bigint" is not completely insane, because if you want to have an API that takes "numbers of arbitrary precision" your options are:

1. Have it just take `bigint`.  Callers can pass `BigInt(0)` or `"0"` but not `0`.
2. Have it take `(bigint or some-numeric-type)`.  Callers can pass `0` sanely.

Option 1 is slightly harder to use as an API, and the reasoning behind `"0"` being OK but `0` not being OK is subtle and likely to make anyone trying to just pass a small numeric constant be annoyed.

Option 2 involves an overload of bigint and numeric, and dataloss if you pass a long-enough string and it gets converted to the numeric.

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