No need to override to_yaml method in ActiveSupport::OrderedHash

activesupport/lib/active_support/ordered_hash.rb

@@ -1,4 +1,3 @@
-require 'psych'
 require 'yaml'
 
 YAML.add_builtin_type("omap") do |type, val|
@@ -25,20 +24,6 @@ module ActiveSupport
       coder.represent_seq '!omap', map { |k,v| { k => v } }
     end
 
-    def to_yaml(opts = {})
-      if !YAML::ENGINE.syck?
-        return super
-      end
-
-      YAML.quick_emit(self, opts) do |out|
-        out.seq(taguri) do |seq|
-          each do |k, v|
-            seq.add(k => v)
-          end
-        end
-      end
-    end
-
     def nested_under_indifferent_access
       self
     end