- validate arguments to interface functions
+ optimize tracing code, still too much overhead
+ use NULL instead of a sentinal node in skiplist and list
+ make the interfaces for all data structures consistent
+ make list and skiplist use string keys
+ optimize integer keys
- validate arguments to interface functions
+ optimize tracing code, still too much overhead
+ use NULL instead of a sentinal node in skiplist and list
+ make the interfaces for all data structures consistent
+ make list and skiplist use string keys
+ optimize integer keys