[3] マイクロタスクチェックポイントを行う処理から呼び出されます。
[1] Call cleanup Indexed Database transactions (annevk著, ) <https://github.com/whatwg/html/commit/915dae1acdf59934d8f7e4820633f727ea33e501>
[2] Implement transaction cleanup hook for [HTML] (inexorabletash著, ) <https://github.com/w3c/IndexedDB/commit/5ae70f2c4ee2e60136ee6d9bdc1ed16cac3853ec>
[4] Make "cleanup IDB transactions" return a value (#232) (domenic著, ) <https://github.com/w3c/IndexedDB/commit/1b85549d004bc2c4436b83d0ec2383cc58126775>
[5] Make "cleanup IDB transactions" return a value by domenic · Pull Request #232 · w3c/IndexedDB () <https://github.com/w3c/IndexedDB/pull/232>
[6] Integrate with requestIdleCallback by domenic · Pull Request #3570 · whatwg/html () <https://github.com/whatwg/html/pull/3570>