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I did the first bullet point by passing a reference around, https://github.com/miniscruff/changie. The second bullet point is a little harder, cmd is sort of like a bin folder for scripts but as go files? In a way. I mostly use it cause that is what cobra defaults to. For the third one, besides speed and consistency it might be due to struct funcs when written using func (a *AStruct) doSomething() {} work both when passed in a pointer or value. Where as func (a AStruct) doSomething() {} only works when used on a value. The last point you can use errors.Is https://pkg.go.dev/errors#Is.
The source for Go's pkg site has been helpful to me https://github.com/golang/pkgsite