# File lib/twitter/core_ext/hash.rb, line 59
  def merge_user!(user, prefix=nil, suffix=nil)
    case user
    when Integer
      self[[prefix, "user_id", suffix].compact.join("_").to_sym] = user
    when String
      self[[prefix, "screen_name", suffix].compact.join("_").to_sym] = user
    when Twitter::User
      self[[prefix, "user_id", suffix].compact.join("_").to_sym] = user.id
    end
    self
  end