public static byte [] toAsciiBytes(boolean v) {
        return v ? TRUE : FALSE;
    }
Encode a long as its decimal representation, i.e. toAsciiBytes(15L) will
return "15" encoded as UTF-8. In other words it is an optimized version
of String.valueOf() followed by UTF-8 encoding. Avoid going through
string in order to get a simple UTF-8 sequence.

@param l
           value to represent as a decimal number encded as utf8
@return byte array
vespajlib/src/main/java/com/yahoo/text/Utf8.java