Explicitly delegate Chars#<=> to work around Kernel#<=> possibly ignoring method_missing

activesupport/lib/active_support/multibyte/chars.rb

@@ -34,7 +34,6 @@ module Multibyte #:nodoc:
     #
     #   ActiveSupport::Multibyte.proxy_class = CharsForUTF32
     class Chars
-
       attr_reader :wrapped_string
       alias to_s wrapped_string
       alias to_str wrapped_string
@@ -45,14 +44,16 @@ def initialize(string)
           @wrapped_string = string
           @wrapped_string.force_encoding(Encoding::UTF_8) unless @wrapped_string.frozen?
         end
-
-        undef <=>
       else
         def initialize(string) #:nodoc:
           @wrapped_string = string
         end
       end
 
+      def <=>(other)
+        @wrapped_string <=> other
+      end
+
       # Forward all undefined methods to the wrapped string.
       def method_missing(method, *args, &block)
         if method.to_s =~ /!$/