func (f *FlagSet) Uint8Var(p *uint8, name string, value uint8, usage string) {
	f.VarP(newUint8Value(value, p), name, "", usage)
}
Uint8Var defines a uint8 flag with specified name, default value, and usage string.
The argument p points to a uint8 variable in which to store the value of the flag.
package pflag
import "strconv"
type uint8Value uint8
func newUint8Value(val uint8, p *uint8) *uint8Value {
	*p = val
	return (*uint8Value)(p)
}
func (i *uint8Value) Set(s string) error {
	v, err := strconv.ParseUint(s, 0, 8)
	*i = uint8Value(v)
	return err
}
func (i *uint8Value) Type() string {
	return "uint8"
}
func (i *uint8Value) String() string { return strconv.FormatUint(uint64(*i), 10) }
func uint8Conv(sval string) (interface{}, error) {
	v, err := strconv.ParseUint(sval, 0, 8)
	if err != nil {
		return 0, err
	}
	return uint8(v), nil
}
func (f *FlagSet) GetUint8(name string) (uint8, error) {
	val, err := f.getFlagType(name, "uint8", uint8Conv)
	if err != nil {
		return 0, err
	}
	return val.(uint8), nil
}