static O[] dropEntryFromParams(O[] params, int i) {
  int n = l(params);
  if (i < 0 || i >= n) ret params;
  if (n == 2) null;
  O[] p = new O[n-2];
  System.arraycopy(params, 0, p, 0, i);
  System.arraycopy(params, i+2, p, i, n-i-2);
  ret p;
}