static <A> A[] singlePlusArrayPlus(A a, A[] l, A... more) {
  A[] out = newObjectArrayOfSameType(l, 1+l(l)+l(more));
  out[0] = a;
  arraycopy(l, 0, out, 1, l(l));
  arraycopy(more, 0, out, 1+l(l), l(more));
  ret out;
}