func NewFallbackValue(from CookieValue, to CookieValue) (*FallbackValue, error) {
	if from == nil || to == nil {
		return nil, errors.New("from and to are mandatory")
	}
	return &FallbackValue{from: from, to: to}, nil
}
NewFallbackValue creates a new FallbackValue
package stickycookie
import (
	"errors"
	"net/url"
)
type FallbackValue struct {
	from CookieValue
	to   CookieValue
}