Roel Wuyts wrote:
> Could somebody who likes the fact that WriteStream modifies the 
> collection passed with #on: give me an actual example where this 
> behaviour is actually desirable/useful (I am not talking about 
> ReadStream here) ?

Buffer streaming. It is very handy to be able to share the underlying 
collection with a stream when you know what you are doing.

Cheers,
   - Andreas