Survey of Round() implementations in Go: https://www.cockroachlabs.com/blog/rounding-implementations-in-go/ (most are wrong, so it will be added to stdlib. Surprisingly hard!)
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I'm coming round to the view that a main function shouldn't take arguments.
For example, in Rust you have to call std::env::args() to get CLI arguments.
This makes Hello World less verbose, and gives you more flexibility in setting up CLI argument parsers.