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

Alternative proposal: scrap the transform() fallback and add an explicit `identity: true` attribute. Transformers can either define a transform() method or set `identity: true`, but cannot do both (or neither). Like the `type` attribute on a source, `identity` is only checked in the constructor and changing it afterwards does nothing.

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