code: public static <T> T[] validIndex(final T[] array, final int index, final String message, final Object... values) {
          return INSTANCE.validIndex(array, index, message, values);
      }
docs: <p>Validates that the index is within the bounds of the argument array; otherwise throwing an exception with the specified message.</p>
  <pre>Validate.validIndex(myArray, 2, "The array index is invalid: ");</pre>
  <p>If the array is {@code null}, then the message of the exception is &quot;The validated object is null&quot;.</p>
  
  @param <T>
  the array type
  @param array
  the array to check, validated not null by this method
  @param index
  the index to check
  @param message
  the {@link String#format(String, Object...)} exception message if invalid, not null
  @param values
  the optional values for the formatted exception message, null array not recommended
  
  @return the validated array (never {@code null} for method chaining)
  
  @throws NullPointerValidationException
  if the array is {@code null}
  @throws IndexOutOfBoundsException
  if the index is invalid
  @see #validIndex(Object[], int)