Error when reverse proxy to gRPC server (which is impl with Node.js)

[idy]

I have a proto3 definition, and use grpc-gateway bridge JSON/HTTP1.1 request to backend PB/gRPC server.
There is a weird error: no coders for int, When grpc-gateway reverse request to node.js server.

I add a log before reverse grpc request and log the grpc response:
Grpc Request Data:

{Time:1477733767 Series:93fc3a3c-e8d2-417b-99da-1f8038e8bb05 DataPoints:[1.1 2.2]}

Grpc Response Metadata:

{HeaderMD:map[grpc-accept-encoding:[identity,deflate,gzip]] TrailerMD:map[]}

Grpc Response Error:

rpc error: code = 13 desc = Illegal wire type for field Message.Field .CollectDataPoint.dataPoints: 2 (1 expected)proto: no coders for int

[idy]

This issue is related with grpc/grpc#5174 and protobufjs/protobuf.js#476

I have a repeated field in proto definition, dcodeIO do not treat proto3's repeated field as packed.