Re: [streams] Transform streams and acknowledgement of writes (#329)

This comment is for byte streams.

```
const ts = TransformStream.identity({ highWaterMark: 0 });
const ws = ts.writable;
const rs = ts.readable;
const writer = (get a reader);
const reader = (get a writer);
```

Let me define readers as:

|                |  who allocates a buffer  | has read ack ? | 
|-------------|---------------------------------|---------------------|
| default    |   readable stream          | N                      |
| BYOB     |   user                             | N                      |
| with-ack  |  readable stream           | Y                      |

Let me define writers as:

|                |  returns buffer when write-fulfilled? | 
|-------------|------------------------------------------------|
| default    | N                                                      |
| retaining | Y                                                      |


It the below behavior reasonable?

| w \ r | default | BYOB | with-ack |
| ------| ----------|----------|-------------|
| default | pass buffer from the writer user to the reader user | buffer the writer user provided buffer and copy it to the reader user provided buffer | pass buffer from the writer user to the reader user |
| retaining | Copy the writer user provide buffer and pass it to the reader user. Return the original buffer to the writer user. | Buffer the writer user provided buffer and copy it to the reader user provided buffer. Return the original buffer to the writer user. | Pass buffer from the writer user to the reader user. When the reader user says it's OK to return it, return it to the writer user. |


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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/streams/issues/329#issuecomment-95052407