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Comparable
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Comparable is the Mix-in for comparable classes. The
including class must provide the basic comparison operator
`<=> '. The other comparing operators are defined in this
module using operator `<=> '.
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Methods:
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self == other
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Returns true if self and the other have same values.
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self > other
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Returns true if self is greater than the other.
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self >= other
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Returns true if self is greater than or equals to the
other.
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self < other
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Returns true if self is less than the other.
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self <= other
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Returns true if self is less than or equals to the
other.
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between?(min, max)
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Returns true if self is in between min and max.
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matz@netlab.co.jp
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