[encoderer]

Hopefully the project maintainer will keep a go1 branch in their repo that only contains 'released' versions of a consistent API.

And in cases where that's not obviously the case, my habit is just to fork the repo and "go get" my own fork. I can then update it as needed.

Not saying these are optimal solutions, but they are solutions. I do personally wish I could "go get" a specific commit or tag.