[arp242]

You should never match against "err.Error()" for conditional error handling, a better solution is to use a custom error type. There are a bunch of different ways to approach this in Go.

[julvo]

Ah that's better, thanks. here a link for others who are reading this https://gobyexample.com/errors

[apta]

Except most libraries do nothing of the sort, so you end up having to do a substring search.

[arp242]

I've rarely run in to this, but if you do then I'd expect most people will be happy to accept a PR.