I haven't used Go in a while, but I remember there was some pain when `Context` began being used for a lot of new APIs but couldn't be introduced to older APIs for compatibility reasons. I also had some frustrations with what seemed like overfitting with standard libraries interfaces, e.g. the interface for closing something returning an error, so then every `close` method would return an error even if it was always nil (which stuck out more to me given that interfaces in Go are implicit, so it wouldn't really be that big a deal to just have a separate interface for closing things without returning an error and no code would have to be changed in all the places that would use it).
