That's exactly what I'm saying. With this change, that may not occur if 
someone had overwritten interval() with some slightly different behavior in 
a subclass and was calling closed_interval(), they would experience an 
unexpected change (or, perhaps more likely, a major slow-down). It would be 
calling the interval() of FinitePoset rather than the subclass.

Best,
Travis


On Tuesday, November 11, 2014 10:33:26 PM UTC-8, Nathann Cohen wrote:
>
> This would check against code within Sage, but anyone who has private code 
>>> could experience unexpected changes (granted it's unlikely, but it is 
>>> visible by the user that is not fixing a bug). I'd just leave this alone as 
>>> it doesn't hurt anyone.
>>
>>
> Travis, don't you think that everybody, on the contrary, EXPECTS that 
> interval return the same thing as closed_interval in subclasses, exactly as 
> it does for the main one ?
>
> Nathann 
>

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