return err // Global headers return here
		}
	}

	// Pack the main header.
	var f formatter // Ignore errors since they are expected
	fmtStr := func(b []byte, s string) { f.formatString(b, toASCII(s)) }
	blk := tw.templateV7Plus(hdr, fmtStr, f.formatOctal)
	blk.setFormat(FormatPAX)
	if err := tw.writeRawHeader(blk, hdr.Size, hdr.Typeflag); err != nil {
		return err
	}