return PkgEncoder{
		stringsIdx: make(map[string]Index),
		syncFrames: syncFrames,
	}
}

// DumpTo writes the package's encoded data to out0 and returns the
// package fingerprint.
func (pw *PkgEncoder) DumpTo(out0 io.Writer) (fingerprint [8]byte) {
	h := md5.New()
	out := io.MultiWriter(out0, h)

	writeUint32 := func(x uint32) {
		assert(binary.Write(out, binary.LittleEndian, x) == nil)
	}

	writeUint32(currentVersion)