irb(main):002:1> module Z
irb(main):003:1>   def x; "x"; end
irb(main):004:1> end
=> nil
irb(main):005:0> module Enumerable
irb(main):006:1>   include Z
irb(main):007:1> end
=> Enumerable
irb(main):008:0> a = [1,2,3,4,5]
=> [1, 2, 3, 4, 5]
irb(main):009:0> a.x
NoMethodError: undefined method `x' for [1, 2, 3, 4, 5]:Array
        from (irb):9
        from :0

Is the Double Inclusion Problem worse than I realized? I thought the
above would be okay b/c 'a' is instantiated _after_ the inclusion
(which is why I've often called it the Dynamic Inclusion Problem).
What gives?

T.