skl/skl.go
func (s *Iterator) SeekForPrev(target []byte) {
	s.n, _ = s.list.findNear(target, true, true) // find <=.
}
func (s *Iterator) SeekForPrev(target []byte) {
	s.n, _ = s.list.findNear(target, true, true) // find <=.
}
func ( s * Iterator ) SeekForPrev ( target [ ] byte ) { s . n , _ = s . list . findNear ( target , true , true ) // find <=. }
// SeekForPrev finds an entry with key <= target.
SeekForPrev finds an entry with key < = target .