src/main/java/org/apache/datasketches/kll/KllDoublesHelper.java [203:213]:
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  static void randomlyHalveUpDoubles(final double[] buf, final int start, final int length, final Random random) {
    assert isEven(length);
    final int half_length = length / 2;
    final int offset = random.nextInt(2);       // disable for validation
    //final int offset = deterministicOffset(); // enable for validation
    int j = (start + length) - 1 - offset;
    for (int i = (start + length) - 1; i >= (start + half_length); i--) {
      buf[i] = buf[j];
      j -= 2;
    }
  }
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src/main/java/org/apache/datasketches/kll/KllFloatsHelper.java [203:213]:
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  static void randomlyHalveUpFloats(final float[] buf, final int start, final int length, final Random random) {
    assert isEven(length);
    final int half_length = length / 2;
    final int offset = random.nextInt(2);       // disable for validation
    //final int offset = deterministicOffset(); // enable for validation
    int j = (start + length) - 1 - offset;
    for (int i = (start + length) - 1; i >= (start + half_length); i--) {
      buf[i] = buf[j];
      j -= 2;
    }
  }
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