Go programmers typically put all their code into one workspace. Over time, it gets really difficult to keep track of dependencies and build artifacts (at least, this is the case for me). In Python development, we keep python versions and dependencies isolated into one workspace per project. This helps isolate the dependencies for that project. Go has the additional headache of cleaning up old binaries. This project is meant to create a new workspace for each project.
To create a development environment
$ go get genv
$ genv test
$ cd test
$ source bin/activate
To undo the dev environment
$ deactivate
To remove the dev environment
$ rm -rf test
Genv assumes alternative go versions are discoverable in your current $PATH. If they are, you can use them in your isolated environment
$ genv -version go1.14.4 test
$ cd test
$ source bin/activate
(test)$ go version
go version go1.14.4 linux/amd64
No. You are free to use this for your own development. However, as of this writing, the community isn't developing in this way.