How should metaclass work?

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How should metaclass work?

Stuart Halloway - February 12, 2008

Facets defines metaclass like this:

  def meta_class(&amp;block)
    if block_given?
      (class &lt;&lt; self; self; end).class_eval(&amp;block)
    else
      (class &lt;&lt; self; self; end)
    end
  end
  alias_method :metaclass, :meta_class

RSpec defines it this way:

  def metaclass
    class &lt;&lt; self; self; end
  end

I just spent an hour figuring out why some carefully-tested code went no-op after adding RSpec to a project. As a community we need to commit to a standard definition here. What should it be?