proto.Size returns 0 for proto3 oneof zero values

[awalterschulze]

syntax = "proto3";

message SampleOneof {
  oneof test_oneof {
    bool Field1 = 1;
    float Field2 = 2;
}

If I set the Field1 to false and call proto.Size it returns 0 where it should return 2.
Basically in properties.go the setEncAndDec method should only set enc_proto3_... and size_proto3_... when proto3 is true and oneof is false.

[dsymonds]

Actually it needs fixing elsewhere. They still need to use size_proto3_... because that's how the oneof wrapper structs are laid out.

[awalterschulze]

Thank you very much :)