Ok I think I'm not understanding this correctly then. Why does this return an error?

    package main

    import (
        "fmt"
    )
    
    const tst = 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
    
    func main() {
        fmt.Println("%v", tst)
    }

Error: ./prog.go:16:17: constant 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 overflows int

See: https://play.golang.org/p/47l5qAsXD5r