Rust crate for converting numbers (integers and floats) to strings with thousands separators.
It is very fast because it uses itoa/dtoa and stack allocated strings.
```rust extern crate prettytoa; use prettytoa::ThousandsSep;
fn main() { let num = 1234567; println!("{} => {}", num, num.thousendssep());
let num = 123_4567.1234567;
println!("{} => {}", num, num.thousends_sep());
} ```