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    classH
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    The classH message, when sent to an object, causes a number to be
    returned which identifies the class of the receiving object.  This
    number is used mainly for internal purposes.  Although it could be used
    for comparisons between objects in a similar way to the class message,
    this is not recommended.  If you do use this message for any reason,
    be aware that when sent to an ordinary object, a positive number is
    returned.  When sent to a class object of the same class, a negative
    number of the same magnitude is returned, ie:

        obj:classH == abs(obj:class:classH)

    However, this behavior will change in the next version of Class(y).