On Aug 5, 3:49    
wrote:
> Nobuyoshi Nakada wrote:
> > Hi,
>
> > At Thu, 10 Jul 2008 16:44:33 +0900,
> > Vladimir Sizikov wrote in [ruby-core:17720]:
> >> This seems to be a common performance trick in MRI, esp. for Fixnums and Strings.
>
> >> Looking at array.c (sort_2), indeed Fixnums and Strings are special-cased.
>
> > I've forgotten to post this patch.
>
> So this is going to be a behavioral change now? My reading of the patch
> tells me it's now checking to see if <=> has been overridden and if so
> using the path that actually calls it. As Ryan pointed out, this would
> be new behavior. Can we get an official ruling on what is correct in 1.8
> and 1.9.x?
>
> - Charlie

And should this behavior apply to condition (e.g. if, unless, while,
etc.)
to call :nil? as well?