static int[] subArray(int[] b, int start, int end) {
  int[] x = new int[end-start];
  System.arraycopy(b, start, x, 0, end-start);
  ret x;
}

meta-for byte also as long {
  static byte[] subArray(byte[] b, int start, int end) {
    start = max(start, 0); end = min(end, l(b));
    if (start >= end) ret new byte[0];
    byte[] x = new byte[end-start];
    System.arraycopy(b, start, x, 0, end-start);
    ret x;
  }
}

static short[] subArray(short[] b, int start, int end) {
  if (start <= 0 && end >= l(b)) ret b;
  short[] x = new short[end-start];
  System.arraycopy(b, start, x, 0, end-start);
  ret x;
}

static float[] subArray(float[] b, int start, int end) {
  float[] x = new float[end-start];
  System.arraycopy(b, start, x, 0, end-start);
  ret x;
}

static O[] subArray(O[] b, int start) {
  ret subArray(b, start, l(b));
}

static O[] subArray(O[] b, int start, int end) {
  start = max(start, 0); end = min(end, l(b));
  if (start >= end) ret new O[0];
  O[] x = new O[end-start];
  System.arraycopy(b, start, x, 0, end-start);
  ret x;
}