native.rb in opal-native-0.0.4.2

- old
+ new

@@ -22,9 +22,11 @@
 
 		Kernel.Native(`object[name].apply(object, args)`)
 	end
 
 	def self.included (klass)
+		return super if klass.respond_to? :from_native
+
 		class << klass
 			def from_native (object)
 				instance = allocate
 				instance.instance_variable_set :@native, object
 