mvcc/backend/batch_tx.go
func (t *batchTx) UnsafeSeqPut(bucketName []byte, key []byte, value []byte) {
	t.unsafePut(bucketName, key, value, true)
}
func (t *batchTx) UnsafeSeqPut(bucketName []byte, key []byte, value []byte) {
	t.unsafePut(bucketName, key, value, true)
}
// UnsafeSeqPut must be called holding the lock on the tx.