Ruby 1.8.3: YAML.dump/load cannot handle Bignum

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I received a report from a Debian user:
<URL:http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=331050>

In Ruby 1.8.2:

  $ ruby -v
  ruby 1.8.2 (2005-04-11) [i386-linux]
  $ ruby -ryaml -e 'puts YAML.dump(1234567890)'
  --- 1234567890
  $ ruby -ryaml -e 'puts YAML.dump(1234567890)' | ruby -ryaml -e 'p YAML.load(ARGF.read)'
  1234567890

In Ruby 1.8.3 (and trunk):

  $ ruby -v
  ruby 1.8.3 (2005-09-21) [i486-linux]
  $ ruby -ryaml -e 'puts YAML.dump(1234567890)'
  !ruby/object:Bignum 1234567890
  $ ruby -ryaml -e 'puts YAML.dump(1234567890)' | ruby -ryaml -e 'p YAML.load(ARGF.read)'
  /usr/lib/ruby/1.8/yaml.rb:133:in `transfer': allocator undefined for Bignum (TypeError)
          from /usr/lib/ruby/1.8/yaml.rb:133:in `load'
          from -e:1

It is a bug of Ruby 1.8.3.  I think that YAML should be able to load
"!ruby/object:Bignum 1234567890".

Thank you.
-- 
akira yamada