module Boolean

A module with no code within it. Just meant to be included, that’s all.

@example Instance type checking

0.is_a?(Boolean)      #=> false
nil.is_a?(Boolean)    #=> false

@example Class type checking

Object < Boolean      #=> nil (false)
NilClass < Boolean    #=> nil (false)
Class < Boolean       #=> nil (false)

@see TrueClass @see FalseClass