// as the symbol will be at the front of the list after the first access.
type moveToFrontDecoder []byte

// newMTFDecoder creates a move-to-front decoder with an explicit initial list
// of symbols.
func newMTFDecoder(symbols []byte) moveToFrontDecoder {
	if len(symbols) > 256 {
		panic("too many symbols")
	}
	return moveToFrontDecoder(symbols)
}

// newMTFDecoderWithRange creates a move-to-front decoder with an initial