// char[] each time it is invoked. However this avoids any
        // synchronization issues and makes the escaper thread safe.
        char[] surrogateChars = new char[2];
        Character.toChars(cp, surrogateChars, 0);
        char[] hiChars = escaper.escape(surrogateChars[0]);
        char[] loChars = escaper.escape(surrogateChars[1]);

        // If either hiChars or lowChars are non-null, the CharEscaper is trying