func (stw *Writer) Write(w io.Writer) error {
	wr128 := func(v uint) error {
		stw.tmp = stw.tmp[:0]
		stw.tmp = uleb128.AppendUleb128(stw.tmp, v)
		if nw, err := w.Write(stw.tmp); err != nil {
			return fmt.Errorf("writing string table: %v", err)
		} else if nw != len(stw.tmp) {
			return fmt.Errorf("short write emitting stringtab uleb")
		}
		return nil
	}
	if err := wr128(uint(len(stw.strs))); err != nil {
		return err
	}