It's great to see this blog post get published. Evan is one of the most creative engineers I've gotten to work with. Go's structural interfaces are often harpe

It's great to see this blog post get published. Evan is one of the most creative engineers I've gotten to work with. Go's structural interfaces are often harped on, but this is exactly a case where they are very useful. Perhaps an approach is to use named interfaces for variance in implementation strategy, and structural directives for usages as described in the blog post. I wouldn't discount how often this pattern comes up.