Try this with both MRI and Jruby 1.1.6 (with active support 2.2.2)

irb(main):004:0> require 'rubygems'
=> true
irb(main):005:0> require 'activesupport'
=> true
irb(main):006:0> YAML.load(YAML.dump(3.0)).eql?(3.0)
=> true

MRI returns true, while JRuby returns false !!!

The root cause is that JRuby is loading the yaml as
irb(main):021:0> YAML.load(YAML.dump(3.0))
=> #<YAML::PrivateType:0x18ad9a0 @value="3.0", @type_id="tag:yaml.org,
2002:float:Float">

instead of as 3.0

Has any bug been logged for this? I would have gone ahead and logged
it, but I am unable to register on codehaus :(. For some wierd reason,
I just can't get thru their capta!!! (another bug???).

Would be great if someone could log this one as a bug or point me to
an already logged bug or otherwise explain this behaviour.

Pradeep