first attempt to fix case where IdTime == None

certainly we need to adjust this in protogen and not in zproto-marshal,
the question is only what's the best way how this could be done..

go/neo/proto/zproto-marshal.go

@@ -6,6 +6,7 @@ package proto
 
 import (
 	"encoding/binary"
+	"math"
 	"reflect"
 	"sort"
 
@@ -1282,7 +1283,12 @@ func (p *NotifyNodeInformation) neoMsgDecodeM(data []byte) (int, error) {
 			{
 				v, tail, err := msgp.ReadFloat64Bytes(data)
 				if err != nil {
-					return 0, mdecodeErr("NotifyNodeInformation.IdTime", err)
+					tail, err = msgp.ReadNilBytes(data)
+					if err != nil {
+						return 0, mdecodeErr("NotifyNodeInformation.IdTime", err)
+					}
+					// see https://lab.nexedi.com/levin.zimmermann/neoppod/-/blob/4d73d206/go/neo/proto/proto.go#L352-353
+					v = math.Inf(-1)
 				}
 				(*a).IdTime = IdTime(v)
 				nread += uint64(len(data) - len(tail))