On Dec 16, 2012, at 11:44 AM, Nicolas Cellier wrote:

> 2012/12/16 Stéphane Ducasse <[email protected]>:
>> polymorphically they are a collection with a first and last :)
>> 
> 
> No.
> 
> (5 to: 4) is different than (3 to: 2) because they specify a different
> cursor position.

Ok that I understand 

> Viewed as collection, they have no first nor last, they're just empty
> 
> Nicolas

I see. But does it make sense to have (thinking aloud)?
        (3 to: 2) start -> 3
        (3 to: 2) end -> 2
probably?

So we should improve that.
If what I said is correct and you confirm it I will open a bug entry
Stef
 



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