can't interface with python generated messages

[timotheecour]

server in python:

def ndarray_to_msg(a):
  assert isinstance(a, np.ndarray)
  return {'nd': True,
                'type': a.dtype.str,
                'shape': a.shape,
                'data': a.tostring()}
import numpy
vals = numpy.zeros((2, 3))
vals=ndarray_to_msg(vals)


def foo():
  # return vals in a python server

client in d:

struct NDArrayMsgpck{
  bool nd;
  string type;
  int[] shape;
  ubyte[] data;
}

auto temp=client.call!NDArrayMsgpck("foo");
// will fail (it returns a Value(map, Via))