From: Florian Gross <florgro@...>
Date: 2007-06-07T22:55:46+09:00
Subject: Odd beaviour with Fixnum#div on negative numbers with floats

Hi,

I'm just going through Rubinius' specification suite making sure that  
the specs correctly match Matz' Ruby
behaviour.

Here's something odd I discovered (same behaviour on 1.8.4  
(2005-12-24) and 1.9.0 (2007-04-02)):

irb(main):001:0> -1.div(2.0)
=> 0
irb(main):002:0> -1.div(2)
=> -1
irb(main):003:0> -1.divmod(2.0)
=> [-1.0, 1.0]
irb(main):004:0> -1.divmod(2)
=> [-1, 1]

I'm on i686-darwin8.8.1. For PPC -1.div(2.0) produces -1.

I think that the behaviour of .div should match .divmod in all cases  
for consistency reasons, but if there is
a good explanation for the behaviour, please feel free to enlighten me.

Thank you!

Kind regards,
Florian Gross