Re: [heycam/webidl] Constant sequence value (#318)

FrozenArray is for representing immutable things.  That's not the same thing as a constant, which is a property whose value is always `===` to whatever you got last time (but could in theory be a mutable object).

It's the difference between:

    var x = {};
    Object.freeze(x);  // immutable thing, but x can be changed to point to something else

and

    const x = {}; // Mutable thing, but x always points to this one object.

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