Re: [whatwg/encoding] Add Streams support (#72)

I don't think duck-typing and symbols are very related. There are many duck-types throughout the platform (and the history of computing) based on string names. For example, everything on the platform that accepts a dictionary argument instead of a class. (Concrete example: DOMPointInit.)

Symbols are mostly used for syntax-triggered protocols like iteration. Although I'm not sure the dividing line is that clearly thought out.

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