if loc := pm.mapLocation(l); loc != nil {
			putNumber(loc.ID)
		}
	}
	putNumber(0) // Delimiter

	for _, l := range sortedKeys1(sample.Label) {
		putDelimitedString(l)
		values := sample.Label[l]
		putNumber(uint64(len(values)))
		for _, v := range values {
			putDelimitedString(v)
		}
	}

	for _, l := range sortedKeys2(sample.NumLabel) {