Re: [whatwg/streams] Convert internal slot accesses in the reference implementation to use symbols (#443)

One thing, though: using things like `Symbol('[[Cancel]]')` in the reference implementation means that the reference implementation and the spec will in fact have different behavior, no?  In particular, the reference implementation will leak its stuff via `Object.getOwnPropertySymbols` and the spec will not.

It's not clear what the goal of the reference implementation is, but if the goal is that it be a correct implementation of the spec while being valid ES6, then I expect the only reasonable way to implement the spec concept of internal slots is via weakmaps that are never exposed directly.

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