package lv

// LabelValues is a type alias that provides validation on its With method.
// Metrics may include it as a member to help them satisfy With semantics and
// save some code duplication.
type LabelValues []string

// With validates the input, and returns a new aggregate labelValues.
func (lvs LabelValues) With(labelValues ...string) LabelValues {
	if len(labelValues)%2 != 0 {
		labelValues = append(labelValues, "unknown")
	}
	return append(lvs, labelValues...)
}