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Do your best to get static types on everything. Play a game with yourself where interface{} is banned and try to do your work. One of the most common sources of such loosely-typed values in JSON, so I'll point out this automatic struct generator for instance. If you have questions about a specific place you don't see how to avoid interface, feel free to ask. Every once in a while I do have to reach for something like this, but it should be rare.
For some in depth examples on how to use reflection in Go and transform types into others, I would suggest you to have a look at clap, the Command Line Argument Parser, and more specifically this file.