[geoka9]

The last two options are not idiomatic Go. (zero, err) and (nonZero, nil) are. So the error check is almost always a simple `if err != nil {return err}`.

[simon_o]

> The last two options are not idiomatic Go.

Who are the authors of https://golang.org/pkg/io again?

Yeah, 90% of Go devs agree with you.

10% think it is a really great idea.

So you can never be sure without reading the documentation.