[heycam/webidl] Explain why array index property names cannot be 2^32 - 1 (#409)

https://github.com/heycam/webidl/blob/d76a9c24901a9734374e8fd9fe790307c3f3989f/index.bs#L12047

It seems pretty mysterious.  A note in the spec would be helpful.  I tried tracing it via blame, but got back to b7e3bf2b and gave up.

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