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原因
oneOfの判定をすべてのサブクラスに対して総当たりで行っていたため、PricingTieredUnitとPricingTieredUsageUnitがともに条件を満たし、「複数マッチ例外」 が発生していた。対応
テンプレートを修正し、
typeディスクリミネータを先に読んで該当サブクラスを 1 件に確定し、そのクラスだけをvalidateするフローに変更。ディスクリミネータが定義されていない
oneOfモデルの場合は、従来どおり総当たりバリデーション。