def inverse_bool(name, value)
      b = convert_bool(name, value)

      if b.nil?
        nil
      else
        !b
      end
    end
def inverse_bool(name, value)
      b = convert_bool(name, value)

      if b.nil?
        nil
      else
        !b
      end
    end
Parses a boolean value and returns its inverse.

 @param value [ String ] The URI option value.

 @return [ true | false | nil ] The inverse of the  boolean value parsed out, otherwise nil
   (and a warning will be logged).