On Tue, Oct 18, 2016 at 11:07 AM, <mike.br...@gmail.com> wrote:

> When working with gRPC in Python,

With what version of gRPC Python are you working, and on what platform?
Also with what version of protocol buffers are you working?

either implementing a service or client code, it would be great if the
> types of the messages being returned or passed in were checked. That is, if
> my service is defined to return a type Foo, but I construct and return a
> type Bar object, the code should throw an error.
> This github issue implies that this is the intended behavior:
> https://github.com/grpc/grpc/issues/3410
> But in fact, I appear to be able to return any Message object without
> throwing any errors.

Any message object, or only mutually serializable message objects?

Is this a bug?

No, but if there's an opportunity here to be more helpful to applications
that contain defects, we're open to it.

Are there differing opinions on how this should work?

There's almost certainly someone out there who believes that since message
serialization is in the RPC path that it shouldn't incur the penalty of
explicit type-checking, but that's not my opinion at this time. What I am
reluctant to do is include explicit type-checking in generated code, which
is where I would think that it would have to go if the message class'
serialization method itself doesn't do the type-checking.

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