class ActiveSupport::Cache::Store

def normalize_options(options)

Normalize aliased options to their canonical form 
def normalize_options(options)
  options = options.dup
  OPTION_ALIASES.each do |canonical_name, aliases|
    alias_key = aliases.detect { |key| options.key?(key) }
    options[canonical_name] ||= options[alias_key] if alias_key
    options.except!(*aliases)
  end
  options
end