Comparable

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 `<=>'.

Methods:

self == other

Returns true if self and the other have same values.

self > other

Returns true if self is greater than the other.

self >= other

Returns true if self is greater than or equals to the other.

self < other

Returns true if self is less than the other.

self <= other

Returns true if self is less than or equals to the other.

between?(min, max)

Returns true if self is in between min and max.

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