Stop checking for OpenStruct#[] and #[]=

Co-authored-by: Jean Boussier <[email protected]>

Author: etiennebarrie

lib/json/generic_object.rb

@@ -52,14 +52,6 @@ def to_hash
       table
     end
 
-    def [](name)
-      __send__(name)
-    end unless method_defined?(:[])
-
-    def []=(name, value)
-      __send__("#{name}=", value)
-    end unless method_defined?(:[]=)
-
     def |(other)
       self.class[other.to_hash.merge(to_hash)]
     end