Doing work that makes your library slower so that certain primitive memory checkers don't get upset doesn't seem like a good use of time to me. Especially when

Doing work that makes your library slower so that certain primitive memory checkers don't get upset doesn't seem like a good use of time to me. Especially when more sophisticated tools (Valgrind at least, probably others) can differentiate between actually leaked memory and stuff that's still reachable at program termination. Obviously there are scenarios where this is not appropriate, but it seems like a reasonable choice in many cases.