Filter on future doesn't make sense

I was trying to figure out what should I accept when filtering over a 
future .
the current implementation yields either a T or an exception which kind of 
breaks referential transparency (doesn't it ?) .
on the other hand what can I expect given this expression 

*def foo(i:Int):Future[Int]*

the type result of 

*foo(1).filter(_ % 2 == 0)*


I.M.H.O I would expect it to yield Option[T]  which makes more sense to 
express that we might get a value that pass the filter or not . is that 
make sense ?

Cheers
Avi 

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