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By the way, you don't need a _ assignment there. You can just do i := range mySlice.

Which I still do constantly, then get a compile error when what I thought was something else is actually an int.

That's a good reason to always include both parts of the LHR:

because if that "something else" actually is an int -- then you'll have a nasty bug at your hands (and not a compiler-catchable one at that).