On 2011-01-19, at 20:50 , Robert Rice wrote: > > You instantiated AnArray. Try this: > > class AnArray < Array; end > > AnArray.kind_of?( Array ) will return false Is this what you're looking for? $ macirb irb(main):001:0> class AnArray < Array; end => nil irb(main):002:0> AnArray <= Array => true