var crypto/x509/pkix.oidSerialNumber

2 uses

	crypto/x509/pkix (current package)
		pkix.go#L189: 	oidSerialNumber       = []int{2, 5, 4, 5}
		pkix.go#L238: 		ret = n.appendRDNs(ret, []string{n.SerialNumber}, oidSerialNumber)