Function format_float

std/json/src/main/serializer.rs:217–227

(f: f64)

}

fn format_float(f: f64) -> String {
    // Integer-valued floats keep a trailing ".0" to disambiguate from int (Python's `json.dumps(1.0)` -> `"1.0"`).
    let s = format!("{}", f);
    if s.contains('.') || s.contains('e') || s.contains('E') || s.contains("inf") || s.contains("NaN") {
        s
    } else {
        let mut t = s;
        t.push_str(".0");
        t
    }
}