code: static String preambleToString(final byte[] byteArr) {
      final Memory mem = Memory.wrap(byteArr);
      return preambleToString(mem);
    }
docs: Returns a human readable string summary of the preamble state of the given byte array.
  Used primarily in testing.
  
  @param byteArr the given byte array.
  @return the summary preamble string.