An empty message in a repeated field will be serialized to empty bytes

[livelxw]

Given

syntax = "proto3";

message MessageA {
  repeated float field_a = 1;
}

message MessageB {
  repeated MessageA field_b = 1;
}

When

s = MessageB(field_b=[MessageA()]).SerializeToString()

Then s will be b'' and if call MessageB.FromString(s) the result will be MessageB() (different from MessageB(field_b=[MessageA()])). But in some other protobuf libraries like Scalapb the serialized string will be \n\000. If call MessageB.FromString(b'\n\000') the result will be MessageB(field_b=[MessageA()])(the expected result). Is this a bug?

[nat-n]

It looks like we differ from the google implementation in this respect, so yes I'd say it is a bug. Thanks for reporting.

[Gobot1234]

Fixed in #180