module Hashie::Extensions::StringifyKeys::ClassMethods

def stringify_keys!(hash)
  hash.extend(Hashie::Extensions::StringifyKeys) unless hash.respond_to?(:stringify_keys!)
  hash.keys.each do |k| # rubocop:disable Performance/HashEachMethods
    stringify_keys_recursively!(hash[k])
    hash[k.to_s] = hash.delete(k)
  end
  hash
end