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  "title": "fix: correctly handle null expireDays in PageCache for cache invalidation",
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  "body_excerpt": "## 概要\nPageCacheのキャッシュ無効化処理に重大なバグが発見され、修正しました。\nPR #237で`expireDays: 0`に変更されましたが、根本的な問題が解決されていませんでした。\n\n## 問題の詳細\n- **発生箇所**: `src/pagecache.ts:48` の `if (expireDays)` 条件\n- **問題**: `null`だけでなく`0`も`false`として評価され、期限チェックがスキップされる\n- **影響**: PR #237で`expireDays: 0`に変更されたが、依然として古いキャッシュが使われ続ける\n- **症状**: 新しく購入した",
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 "pr_url": "https://github.com/tomacheese/booth-purchased-items-manager/pull/239",
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