DynDelete
int DynDelete (DynObject obj, int idx);
if (DynDelete(obj, DynHigh(obj) / 2) != DYN_OK) {
if (DynDelete(obj, DynHigh(obj) * 2) == DYN_OK) {
if (DynDelete(obj, -1) != DYN_BADINDEX ||
DynDelete(obj, 0) != DYN_BADINDEX ||
DynDelete(obj, 100) != DYN_BADINDEX) {