svoid intToBytes_inArray_littleEndian_partial(int i, byte[] array, int idx) {
  if (idx < array.length) array[idx] = (byte) i;
  if (idx+1 < array.length) array[idx+1] = (byte) (i >>> 8);
  if (idx+2 < array.length) array[idx+2] = (byte) (i >>> 16);
  if (idx+3 < array.length) array[idx+3] = (byte) (i >>> 24);
}

Began life as a copy of #1029377