Re: [whatwg/streams] light weight transformations (#461)

pull-stream looks cool!

Regarding transformations, one concern for web streams is that today's parser and converter ecosystem is geared for other streams/iterators, predominantly Node streams. If I'm writing a new parser, I'd love for it to be usable by everyone, regardless of their preference for stream/iterator implementation. But limited time on my part means I'm not going to write a version for every stream/iterator implementation.

That means I'll probably write my new parser for either 1) Node streams, because that's where most users are or 2) transducers, because then it's usable with [native or Underscore reduce implementations](https://github.com/cognitect-labs/transducers-js#integration), [immutable-js](https://github.com/jlongster/transducers.js?files=1#immutable-js) [Node streams](http://highlandjs.org/#transduce), [RxJS](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/gettingstarted/transducers.md), etc.

It would be great if the transformation option for web streams made it easy for me when I'm writing that new parser. Could the transformation option simply be a `transduce` operator?

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