return 0
	default:
		return n
	}
}

func (db *DB) shortestIdleTimeLocked() time.Duration {
	if db.maxIdleTime <= 0 {
		return db.maxLifetime
	}
	if db.maxLifetime <= 0 {
		return db.maxIdleTime
	}
	return min(db.maxIdleTime, db.maxLifetime)
}

// SetMaxIdleConns sets the maximum number of connections in the idle
// connection pool.
//

			int64(usedConns - reusedConns),
			10 * time.Millisecond,
			0,
		},
		{
			// Want to close some connections via max idle time and one by max lifetime.
			time.Millisecond,
			// nowFunc() - MaxLifetime should be 1 * time.Nanosecond in connectionCleanerRunLocked.
			// This guarantees that first opened connection is to be closed.
			// Thus it is timeOffset + secondTimeOffset + 3 (+2 for Close while reusing conns and +1 for Conn).