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Metaclass for enumeration.

    To define your own enumeration, do something like

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        red = 1
        green = 2
        blue = 3

    Now, Color.red, Color.green and Color.blue behave totally
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Constructor -- create an enumeration.

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Return an enumeration value.

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Class to represent an enumeration value.

    EnumInstance('Color', 'red', 12) prints as 'Color.red' and behaves
    like the integer 12 when compared, but doesn't support arithmetic.

    XXX Should it record the actual enumeration rather than just its
    name?

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