public boolean rem(float k) {
   long index = indexOf(k);
   if (index == -1) return false;
   to--;
   l.removeFloat(from + index);
   if (ASSERTS) assertRange();
   return true;
 }
 public float removeFloat(long index) {
   ensureRestrictedIndex(index);
   to--;
   return l.removeFloat(from + index);
 }