case io.EOF:
				r.err = io.ErrUnexpectedEOF
				return io.ErrUnexpectedEOF
			}
			r.err = err
			return err
		}
		// Read name without allocating more than 1 buffer.
		sz, err := r.mr.ReadStringHeader()
		if err != nil {
			r.err = err
			return err
		}
		if cap(tmp) < int(sz) {
			tmp = make([]byte, 0, sz+256)
		}
		tmp = tmp[:sz]
		_, err = r.mr.R.ReadFull(tmp)
		if err != nil {