I found this blog entry:
http://raveendran.wordpress.com/2009/06/29/ruby-big-decimal/
Which shows the following..

irb(main):011:0> require 'bigdecimal'
=> true
irb(main):012:0> x = BigDecimal("123.6") - BigDecimal("123")
=> #<BigDecimal:28c5b84,'0.6E0',4(16)>
irb(main):013:0> puts x.to_f
0.6
=> nil
irb(main):014:0> puts f=123.6 - 123
0.599999999999994
=> nil
irb(main):015:0> 123.6 - 123
=> 0.599999999999994
irb(main):016:0> 123.6 - 123.0
=> 0.599999999999994
irb(main):017:0>

That's a little strange.. Isn't it?
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