svoid intToBytes_inList_littleEndian_partial(int i, L<Byte> l, int idx) {
  int n = l(l);
  if (idx < n) l.set(idx, (byte) i);
  if (idx+1 < n) l.set(idx+1, (byte) (i >>> 8));
  if (idx+2 < n) l.set(idx+2, (byte) (i >>> 16));
  if (idx+3 < n) l.set(idx+3, (byte) (i >>> 24));
}

Began life as a copy of #1031654