default.go
func (u *ISBN) DeepCopy() *ISBN {
	if u == nil {
		return nil
	}
	out := new(ISBN)
	u.DeepCopyInto(out)
	return out
}
func (u *ISBN) DeepCopy() *ISBN {
	if u == nil {
		return nil
	}
	out := new(ISBN)
	u.DeepCopyInto(out)
	return out
}
func ( u * ISBN ) DeepCopy ( ) * ISBN { if u == nil { return nil } out := new ( ISBN ) u . DeepCopyInto ( out ) return out }
// DeepCopy copies the receiver into a new ISBN.
DeepCopy copies the receiver into a new ISBN .