Re: [streams] explicity operate on underlying source and sink instead of public methods (#321)

What do you mean by "specific ones implemented natively"?  I think we want to be able to do this piping off-main-thread:

```
rs.pipeTo(ws);
```

But if pipeTo() operates on public methods, then this cannot occur with:

```
ws.write = function() { ... };
rs.pipeTo(ws);
```

Code working with streams should not have to do an "if native, call different functions" switch.

Trying to detect a function override complicates optimizations and also comes at a perf cost due to constant checking on every call.

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