From: Joel VanderWerf <vjoel@...>
Date: 2006-03-06T16:07:30+09:00
Subject: Re: [YAML]  Bignum problems

Joel VanderWerf wrote:
> The problems with Bignums in recent YAMLs have been discussed(*), but
> does anyone have a patch that can be loaded in ruby code to get around it?
> 
> This just turned into a minor disaster for me...
> 
> $ ruby -v
> ruby 1.8.4 (2005-12-24) [i686-linux]
> $ ruby -r yaml -e 'y 1234567890'
> --- !ruby/object:Bignum 1234567890
> $ ruby -r yaml -e 'YAML.load 1234567890.to_yaml'
> /usr/local/lib/ruby/1.8/yaml.rb:133:in `transfer': allocator undefined
> for Bignum (TypeError)
>         from /usr/local/lib/ruby/1.8/yaml.rb:133:in `load'
>         from -e:1
> 
> (*)
> http://groups.google.com/group/comp.lang.ruby/browse_frm/thread/4d62fa19fc7f4ffe/2331cd65b83bffe2?q=YAML+Bignum&rnum=1#2331cd65b83bffe2
> 

I think this workaround actually works:

if RUBY_VERSION == "1.8.4"
  class Bignum
    def to_yaml( opts = {} )
      YAML::quick_emit( nil, opts ) { |out|
        out.scalar( nil, to_s, :plain )
      }
    end
  end
end

...that sure beats compiling cvs for several platforms and distributing
it to users.

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407