Re: [whatwg/webidl] ObservableArray types in namespace (#1000)

Regarding the specific question as to why the backing list is the source of truth instead of the wrapped `Array` object itself, it's because we don't want spec authors (or C++ code authors) to have to mess with with raw ES `Array` objects. There is some discussion of this (if you squint) in the initial few comments of the original PR: https://github.com/whatwg/webidl/pull/840

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