Why isn't Cloud Endpoints for Golang in GAE Standard Environment?

Hey does anyone know why Google Cloud Endpoints for Go-lang isn't in the standard environment on Google App Engine? It's only seemed to be officially supported/documented for Python / Java.

Is it because

A) Cloud Endpoints is coming to Golang soon / someday.

B) Cloud Endpoints isn't so great, so it's not going to be implemented in Golang.

C) Something else.

There's this "non-standard" lib https://github.com/GoogleCloudPlatform/go-endpoints but it hasn't been updated in 9 months.

I'm trying to choose between Python and Golang for a GAE project, and this lack of support for Cloud Endpoints is giving me pause.

Thanks in advance.

Product manager Dan Ciruli answered this on the google-appengine-go mailing list :

> There are two primary reasons, and the second is a byproduct of the
> first. We've had much less uptake on the Endpoints Go framework --
> perhaps because, in the words of a developer I spoke to, "Go just
> isn't a 'framework' language." Unlike, Java, Python (and, say, Node),
> most developers using Go don't use a framework for writing an API
> backend.
>
> And, at least partially because of that, we aren't staffed on the
> Endpoints team to build and support a framework in Go.

He added:

> All hope is not lost. You can put a Go API behind Endpoints today on
> GAE Flex or Container Engine (without framework) using the Extensible
> Server Proxy. And later this year, we should be able to get the ESP
> deployed in GAE standard environment, you'll get the full power there,
> too.