Three reasons:

- I believe they wouldn't be needed anymore with the new variables/ 
combinators.
- Because I/O through a duplex stream entails an extra level of  
indirection.
- Implementations of things like setting the timeout, changing the  
encoding is ugly with duplex streams.
- The implementation of duplex streams themselves contains a fair bit  
of boilerplate. I could move Dan's delegate library to the core but  
I'd rather not do that if duplex streams are the only use-case in the  
core.

Basically I think they would become redundant and since they're kind  
of ugly its best not to have them.

Slava

On Apr 22, 2008, at 3:09 PM, Eduardo Cavazos wrote:

> What's the main motivation for removing duplex streams?
>
> I'd like to point out that it sort of moves in away from the  
> direction I've
> argued for in general; that of "combining" objects on the stack  
> instead of
> splitting them up. Areas where I've emphasized this principle are the
> encodings api and cursors.
>
> Let me just say that exceptions to principles should be made when  
> they're
> justified. You might not subscribe to this principle, but from my
> perspective, I'm very interested in the reasons behind the change.
>
> Ed
>
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