[whatwg/webidl] Intent use number / bigint union type (Issue #1426)

### What is the issue with the Web IDL Standard?

In WebAssembly we are planning on using the union of long long and bigint: https://github.com/WebAssembly/memory64/pull/75

In accordance with the warning in https://webidl.spec.whatwg.org/#idl-union we are opening this issue.

I believe that our use case doesn't run into any issues because we are essentially implementing overloading based on the type of the receiver.  The receiver is either a 64-bit memory/table (in which case we expect bitint indexes) or a 32-bit memory/table (in which case we expect number indexes).

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