Re: [whatwg/streams] Don't mandate transform method in TransformStream (#573)

> Could you file an issue for the testing gap you noticed?

Looking into it, this would have been caught is if all the `helper.js` ops were made into function-functions instead of arrow functions, and had an appropriate `assert(arguments.length === 5);` at the top. Or asserting that all arguments weren't undefined individually, because as-is it 'works' if all are undefined.

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