@SuppressWarnings("unused")
    public static FastStr unsafeOf(char[] buf) {
        E.NPE(buf);
        return new FastStr(buf, 0, buf.length);
    }
@ SuppressWarnings ( "unused" ) public static FastStr unsafeOf ( char [ ] buf ) { E . NPE ( buf ) ; return new FastStr ( buf , 0 , buf . length ) ; }
Construct a FastStr instance from char array without array copying
@param buf the char array
@return a FastStr instance from the char array