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doctree の pull request の CI で head のときにエラーになって、ちゃんと確認できない状態になっているので、
gemspec
に依存を足して、とりあえず ruby 3.4 でも動くようにしておく。drb
を不要なときに読み込まないようにする、 NKF からString#encode
への移行などの根本的な対応は今度の予定にしておく。