src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts/AbstractTaskService/_savePersistentTasks
class AbstractTaskService:	private _savePersistentTasks(): void {
		if (!this._persistentTasks) {
			return;
		}
		const keys = [...this._persistentTasks.keys()];
		const keyValues: [string, string][] = [];
		for (const key of keys) {
			keyValues.push([key, this._persistentTasks.get(key, Touch.None)!]);
		}
		this._storageService.store(AbstractTaskService.PersistentTasks_Key, JSON.stringify(keyValues), StorageScope.WORKSPACE, StorageTarget.USER);
	}