fix out of bounds error

memory_iter.go

@@ -79,7 +79,7 @@ func (i *MemoryIterator[T]) GetAllKeys() []string {
 }
 
 func (i *MemoryIterator[T]) Key() string {
-	if i.pos < 0 || i.pos > i.Count() || i.released {
+	if i.pos < 0 || i.pos >= i.Count() || i.released {
 		return ""
 	}
 	return i.k[i.pos]