From: Logan Capaldo <logancapaldo@...>
Date: 2006-01-15T15:23:58+09:00
Subject: Re: Duration between two days


On Jan 15, 2006, at 1:12 AM, Brian Buckley wrote:

>> irb(main):002:0> require "mathn"
>
>
> Though getting a Rational back is not incorrect, clearly getting a  
> Fixnum
> back would be one's initial expectation.
>
> Interesting that 'mathn' caused a change in return type.  I suppose  
> that
> means the return type is not part of the date subtraction contract.  I
> quickly eyeballed mathn.rb to try to see the specific reason for  
> the change
> in return type.  My guess if that Date - Date uses the ** operator  
> because
> ** is redefined in mathn.
>
>
> Brian Buckley

Requiring mathn did not change the return type. Requiring mathn  
changed how rationals display themselves (ie it changed  
Rational#inspect). (It also changed Integer#/ to return rationals  
instead of Integers, among other things I am sure)