requires active_support/inflector/methods...

requires active_support/inflector/methods active_support/core_ext/string/inflections in local_cache.rb because it uses underscore

activesupport/lib/active_support/cache/strategy/local_cache.rb

 require 'active_support/core_ext/object/duplicable'
+require 'active_support/inflector/methods active_support/core_ext/string/inflections'
 
 module ActiveSupport
   module Cache