mark unicode normalization with type

irc/net.go

@@ -5,25 +5,25 @@ import (
 	"strings"
 )
 
-func IPString(addr net.Addr) string {
+func IPString(addr net.Addr) Name {
 	addrStr := addr.String()
 	ipaddr, _, err := net.SplitHostPort(addrStr)
 	if err != nil {
-		return addrStr
+		return Name(addrStr)
 	}
-	return ipaddr
+	return Name(ipaddr)
 }
 
-func AddrLookupHostname(addr net.Addr) string {
+func AddrLookupHostname(addr net.Addr) Name {
 	return LookupHostname(IPString(addr))
 }
 
-func LookupHostname(addr string) string {
-	names, err := net.LookupAddr(addr)
+func LookupHostname(addr Name) Name {
+	names, err := net.LookupAddr(addr.String())
 	if err != nil {
-		return addr
+		return Name(addr)
 	}
 
 	hostname := strings.TrimSuffix(names[0], ".")
-	return hostname
+	return Name(hostname)
 }