gistfile1.rb

class FL
  def initialize(array)
    @ary = array
  end
  def ==(array)
    to_ary == array
  end
  def to_ary
    @ary
  end
end

# This is true in both MRI and JRuby:
p(['a'] == FL.new(['a']))

# Oddly, this is true only in MRI, it is false in JRuby
p([['a']] == [FL.new(['a'])])