# File lib/twitter/core_ext/hash.rb, line 83
  def merge_users!(*users)
    user_ids, screen_names = [], []
    users.flatten.each do |user|
      case user
      when Integer
        user_ids << user
      when String
        screen_names << user
      when Twitter::User
        user_ids << user.id
      end
    end
    self[:user_id] = user_ids.join(',') unless user_ids.empty?
    self[:screen_name] = screen_names.join(',') unless screen_names.empty?
    self
  end