decoder.go
func DecodeInt8(bz []byte) (i int8, n int, err error) {
	var i64 = int64(0)
	i64, n, err = DecodeVarint(bz)
	if err != nil {
		return
	}
	if i64 < int64(math.MinInt8) || i64 > int64(math.MaxInt8) {
		err = errors.New("EOF decoding int8")
		return
	}
	i = int8(i64)
	return
}
func DecodeInt8(bz []byte) (i int8, n int, err error) {
	var i64 = int64(0)
	i64, n, err = DecodeVarint(bz)
	if err != nil {
		return
	}
	if i64 < int64(math.MinInt8) || i64 > int64(math.MaxInt8) {
		err = errors.New("EOF decoding int8")
		return
	}
	i = int8(i64)
	return
}
//----------------------------------------
// Signed