func (ls Labels) Copy() Labels {
	res := make(Labels, len(ls))
	copy(res, ls)
	return res
}
func (ls Labels) Copy() Labels {
	res := make(Labels, len(ls))
	copy(res, ls)
	return res
}
func ( ls Labels ) Copy ( ) Labels { res := make ( Labels , len ( ls ) ) copy ( res , ls ) return res }
// Copy returns a copy of the labels.
Copy returns a copy of the labels .