port number conversion error in flow stats REST API

The Port and EtherType Values do not appear correlctly when requesting the Flow Stats from REST API

If I look at Wireshark I see for instance an LLDP Packet in the flow-stats-reply with
ethertype : 35020 (0x88cc)
port out : 4294967293
[see attached picture]

the information that I think is supposed to be related to that, from the REST API (http://10.1.0.16:8181/onos/v1/flows) gives
ether type: -30516
port out: -3
[see JSON output from REST Request below]

ARP packets show similar values, the ARP Ethertype shows up correct in the REST Response, but also with some negative port Value.

"flows": [
{
"id": "10414575354596821",
"appId": "org.onosproject.core",
"groupId": 0,
"priority": 40000,
"timeout": 0,
"isPermanent": true,
"deviceId": "of:0000000000000001",
"state": "ADDED",
"life": 241,
"packets": 0,
"bytes": 0,
"lastSeen": 1449400662116,
"treatment": {
"instructions": [

{ "type": "OUTPUT", "port": -3 }

],
"deferred": []
},
"selector": {
"criteria": [

{ "type": "ETH_TYPE", "ethType": -30516 }

]
}
},
{