protected void encodeDATA(byte[] value) {
            out.append('"');
            out.append("0x");
            for (int pos = 0; pos < value.length; pos++) {
                out.append(hex[(value[pos] >> 4) & 0xf]);
                out.append(hex[value[pos] & 0xf]);
            }
            out.append('"');
        }
Renders the given value to the target stringbuilder with a given encoder.
This is useful to use an encoder where rendering of some value types is customized.
vespajlib/src/main/java/com/yahoo/data/access/simple/JsonRender.java