Re: [streams] Change the model for ReadableStream to have async read() (#288)

| | pull() + sync read() | async read() |
| handling read data | easy. for-loop + readableness check | promise based. one microtask for each chunk |
| correspondence between pull() and read() | less clear |  clear |
| affinity with locking infrastructure | bad | good |

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https://github.com/whatwg/streams/pull/288#issuecomment-76885522