Re: [whatwg/streams] How much latitude should implementations have in looking up transformer.transform()? (#691)

> If the objects passed to Stream constructors behave differently from Javascript objects in other contexts then we're going against our own design philosophy.

I guess I'm not as conflicted because even though they behave differently, it's really not a big deal in practice. I've never really seen JavaScript code that dynamically changes the methods of an object passed elsewhere and expects that to be respected---even though it's probably the case that doing so would work, since most object-accepting code will use `foo.bar()` instead of `previouslySavedBar.call(foo)`.

Oh, and also, we use the same pattern for custom elements. Here was the thread with arguments for it at that time: https://github.com/w3c/webcomponents/issues/417

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