all: sync with master

internal/dhcpd/dhcpd.go

@@ -9,8 +9,8 @@ import (
 	"time"
 
 	"github.com/AdguardTeam/golibs/log"
-	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/timeutil"
+	"golang.org/x/exp/slices"
 )
 
 const (
@@ -54,8 +54,8 @@ func (l *Lease) Clone() (clone *Lease) {
 	return &Lease{
 		Expiry:   l.Expiry,
 		Hostname: l.Hostname,
-		HWAddr:   netutil.CloneMAC(l.HWAddr),
-		IP:       netutil.CloneIP(l.IP),
+		HWAddr:   slices.Clone(l.HWAddr),
+		IP:       slices.Clone(l.IP),
 	}
 }
 
@@ -242,7 +242,7 @@ func Create(conf *ServerConfig) (s *server, err error) {
 	v4conf := conf.Conf4
 	v4conf.InterfaceName = s.conf.InterfaceName
 	v4conf.notify = s.onNotify
-	v4conf.Enabled = s.conf.Enabled && len(v4conf.RangeStart) != 0
+	v4conf.Enabled = s.conf.Enabled && v4conf.RangeStart.IsValid()
 
 	s.srv4, err = v4Create(&v4conf)
 	if err != nil {