@type t() :: %FeedReader.Item{
  alternate: map(),
  author: String.t() | nil,
  canonical_url: String.t() | nil,
  content_full: String.t() | nil,
  content_summary: String.t() | nil,
  extensions: %{optional(String.t()) => map()},
  language: atom() | nil,
  published_at: DateTime.t() | nil,
  title: String.t() | nil,
  uuid: String.t() | nil
}