From: Wilson Bilkovich <wilsonb@...>
Date: 2007-09-27T23:10:51+09:00
Subject: Re: Bug in BigDecimal#round ?

On 9/27/07, Jano Svitok <jan.svitok@gmail.com> wrote:
> On 9/27/07, Ryan Platte <ryan.platte@gmail.com> wrote:
> > On Sep 27, 6:25 am, "Jano Svitok" <jan.svi...@gmail.com> wrote:
> > > > It seems to me as a bug. The code in trunk is the same, so I guess
> > > > it's not fixed yet.
> > >
> > > reported as #14271
> >
> > Thank you very much for reporting the bug.
>
> I guess you can workaround the bug until it gets properly fixed - by
> opening the BigDecimal class. Last night I could not come with
> anything reasonable though ;-)
>
> class BigDecimal
>    alias_method :old_round, :round
>    def round(*args)
>       if XXX
>          self.class.new(YYY)
>       else
>          old_round(*args)
>       end
>    end
> end
>
> the problematic parts are XXX and YYY... ;-)
> args[0] and self.exponent might be usable...
>
> I haven't found any unit tests for BigDecimal, so if you create some,
> please post them somewhere (I'm not sure where - possible choises are:
> ruby tracker, http://rubyforge.org/projects/bfts/ tracker, ruby-core
> mailing list)
>

JRuby has some:
http://svn.codehaus.org/jruby/trunk/jruby/test/test_big_decimal.rb

If you come up with some more, you could either submit them as a patch
there, or post them to ruby-core.

When we get around to BigDecimal in Rubinius, we will probably use the
JRuby test case as a starting point, and then fill in any gaps we
find. If you've posted some of them to ruby-core, that makes life
easier.