persist

var (
	ErrNotFound         = errors.New("not found")
	ErrGone             = errors.New("gone")
	ErrReadOnly         = errors.New("read-only mode")
	ErrSnapshotReleased = errors.New("snapshot released")
	ErrIterReleased     = errors.New("iterator released")
	ErrClosed           = errors.New("closed")
	ErrVersionMismatch  = errors.New("version mismatch")
)