Re: [whatwg/streams] Don't create { value, done } objects with Object.prototype for internal use (a27a1fd)

Hi, I'm adding these changes to my implementation and while the new test `piping/then-interception` now passes nicely, I'm getting test failures in many basic tests as they try to pass in objects created with `ReadableStreamCreateReadResult` as the `actual` param of `assert_object_equals`, which tries to call `actual.hasOwnProperty` which is not there.

Easy to test by trying to run e.g. `readable-streams/cancel.html` but other tests in the readable-streams dir have failures as well.

I realise the fix should be in the WPT repo but figured I report this here as this is the source of the failures. I just pulled from WPT so I either I'm doing something wrong or the tests are now broken.

Ping @ricea 

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