refactor: Prefer strconv.Itoa over fmt.Sprint

[EmilGeorgiev]

Issue summary

strconv.Itoa is faster than fmt.Sprint and is preferred for converting integers to strings. The example below demonstrates the difference between them.

func BenchmarkStrconv(b *testing.B) {
    for j := 0; j < b.N; j++ {
        _ = strconv.Itoa(80) //BenchmarkStrconv-16      508842183            2.283 ns/op
    }
}

vs

func BenchmarkFMT(b *testing.B) {
    for j := 0; j < b.N; j++ {
        _ = fmt.Sprint(80) // BenchmarkFMT-16       23801236            52.26 ns/op
    }
}

[EmilGeorgiev]

If you think this makes sense, can I take this issue?