pub fn write_to_string(&self, dst: &mut String) -> Result<(), toml::ser::Error> {
        let mut serializer = Serializer::pretty(dst);
        serializer.pretty_array(false);
        self.serialize(&mut serializer)
    }
Serializes this summary into the given TOML string, using pretty TOML syntax.
guppy-summaries/src/summary.rs