@Override
    public Entry<K, V>[] createArray(int length) {
      return generator.createArray(length);
    }

    @Override
    public Iterable<Entry<K, V>> order(List<Entry<K, V>> insertionOrder) {
      return generator.order(insertionOrder);
    }

    @SuppressWarnings("unchecked")
    @Override
    public K[] createKeyArray(int length) {
      return (K[]) new Object[length];
    }

    @SuppressWarnings("unchecked")

    int maxSuffixLength = Math.min(a.length(), b.length());
    int s = 0;
    while (s < maxSuffixLength && a.charAt(a.length() - s - 1) == b.charAt(b.length() - s - 1)) {
      s++;
    }
    if (validSurrogatePairAt(a, a.length() - s - 1)
        || validSurrogatePairAt(b, b.length() - s - 1)) {
      s--;
    }
    return a.subSequence(a.length() - s, a.length()).toString();
  }

  /**

      return asList(all).subList(2, elements.length + 2);
    }
  }

  private static Long[] concat(Long[] left, Long[] right) {
    Long[] result = new Long[left.length + right.length];
    System.arraycopy(left, 0, result, 0, left.length);
    System.arraycopy(right, 0, result, left.length, right.length);
    return result;
  }

    }

    if (slice && bytes.length > 0) {
      // test a random slice() of the ByteSource
      Random random = new Random();
      byte[] expected = factory.getExpected(bytes);
      // if expected.length == 0, off has to be 0 but length doesn't matter--result will be empty
      int off = expected.length == 0 ? 0 : random.nextInt(expected.length);
      int len = expected.length == 0 ? 4 : random.nextInt(expected.length - off);

    assertEquals(expected.length(), reader.skip(Long.MAX_VALUE));
    assertFullyRead(reader);

    // skip 5 and read the rest
    if (expected.length() > 5) {
      reader = new CharSequenceReader(charSequence);
      assertEquals(5, reader.skip(5));

      buf = new char[expected.length() - 5];
      assertEquals(buf.length, reader.read(buf, 0, buf.length));

        if (a.length != b.length) {
          return false;
        }
        boolean areEqual = true;
        for (int i = 0; i < a.length; i++) {
          areEqual &= (a[i] == b[i]);
        }
        return areEqual;
      }
    },
    XORING_TO_BYTE {
      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {
          return false;
        }

        if (a.length != b.length) {
          return false;
        }
        boolean areEqual = true;
        for (int i = 0; i < a.length; i++) {
          areEqual &= (a[i] == b[i]);
        }
        return areEqual;
      }
    },
    XORING_TO_BYTE {
      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {
          return false;
        }

    assertTrue(x != y);
    assertEquals(x.length(), y.length());
    for (int i = 0; i < SIZE; i++) {
      assertBitEquals(x.get(i), y.get(i));
    }

    AtomicDoubleArray a = new AtomicDoubleArray(VALUES);
    AtomicDoubleArray b = serialClone(a);
    assertFalse(a.equals(b));
    assertFalse(b.equals(a));
    assertEquals(a.length(), b.length());
    for (int i = 0; i < VALUES.length; i++) {

      for (String comp : components) {
        sb.append(comp);
        sb.append(DELIMITER_STRING);
      }
      if (sb.length() > 0) {
        sb.setLength(sb.length() - DELIMITER_STRING.length());
      }
      dummy ^= sb.toString().length();
    }
    return dummy;
  }

   */
  public static boolean equalsIgnoreCase(CharSequence s1, CharSequence s2) {
    // Calling length() is the null pointer check (so do it before we can exit early).
    int length = s1.length();
    if (s1 == s2) {
      return true;
    }
    if (length != s2.length()) {
      return false;
    }
    for (int i = 0; i < length; i++) {
      char c1 = s1.charAt(i);
      char c2 = s2.charAt(i);
      if (c1 == c2) {