default.go
func (u *ISBN13) DeepCopy() *ISBN13 {
	if u == nil {
		return nil
	}
	out := new(ISBN13)
	u.DeepCopyInto(out)
	return out
}
func (u *ISBN13) DeepCopy() *ISBN13 {
	if u == nil {
		return nil
	}
	out := new(ISBN13)
	u.DeepCopyInto(out)
	return out
}
func ( u * ISBN13 ) DeepCopy ( ) * ISBN13 { if u == nil { return nil } out := new ( ISBN13 ) u . DeepCopyInto ( out ) return out }
// DeepCopy copies the receiver into a new ISBN13.
DeepCopy copies the receiver into a new ISBN13 .