Inheritance: Class variables and constants in Ruby

gistfile1.rb

class C1
  SOME_CONST=3
  @@some_class_var = 3
end

class C2<C1
  SOME_CONST=7
end

class C3<C1
  @@some_class_var = 4
end

p C1::SOME_CONST # => 3
p C2::SOME_CONST # => 7
p C3::SOME_CONST # => 3

p C1.send :class_variable_get, '@@some_class_var' # => 4
p C2.send :class_variable_get, '@@some_class_var' # => 4
p C3.send :class_variable_get, '@@some_class_var' # => 4