docs: public void str(Pointer ptr, int len, IoStrRead read) {
          resetCursor();
          io_type = IOType.Str;
          JechtIO.Str ss = new JechtIO.Str();
          io = ss;
          ss.beg = ptr.start;
          ss.ptr = ptr;
          ss.end = ptr.start + len;
          if(read == null) {
              ss.read = new IoStrRead.Default();
          } else {
              ss.read = read;
          }
      }