You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: diff.rb
    path of file: ./repos/gitlabhq/lib/gitlab/git
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Git
    class Diff
      TimeoutError = Class.new(StandardError)
      include Gitlab::EncodingH
    
      def to_hash
        hash = {}

        SERIALIZE_KEYS.each do |key|
          hash[key] = send(key) # rubocop:disable GitlabSecurity/PublicSend
        end

        hash
      end