friendly_bools.rb

class FalseClass
  def +(b); 0 + b.to_i; end
  def to_i; 0; end
end

class TrueClass
  def +(b); 1 + b.to_i; end
  def to_i; 1; end
end

class Fixnum
  alias :_plus :+
  def +(b); _plus(b.to_i); end
end