func (v Int8) Get(deflt int8) int8 {
	if !v.Defined {
		return deflt
	}
	return v.V
}
Get returns the value or given default in the case the value is undefined.
package opt
import (
	"fmt"
	"github.com/mailru/easyjson/jlexer"
	"github.com/mailru/easyjson/jwriter"
)
type Int8 struct {
	V       int8
	Defined bool
}
func OInt8(v int8) Int8 {
	return Int8{V: v, Defined: true}
}