`--package-name` with namespaces (containing `.`) is not translated to directories

[micolous]

I want to generate code that goes into a namespaced package (eg: my_service.client).

My first instinct is to specify this with --package-name, eg:

--package-name my_service.client

But this builds a client library where the top-level directory of the package is literally my_service.client, when it should actually be in my_service/client.

Workaround

--package-name my_service/client