@arch@floofy.tech try nanoserde! its like serde, except, well, not as big.

example (forgive me if i misremembered the api)

use nanoserde::{DeBin, SerBin};
use std::fs;

#[derive(SerBin, DeBin, Debug)]
struct Obesity {
    falsity: bool,
    name: String,
    weight: u8,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let x = Obesity {
        name: "Obesity".to_string(),
        weight: 5,
        falsity: true,
    };

    fs::write("save.dat", x.serialize_bin())?;

    let bytes = fs::read("save.dat")?;
    let loaded: Obesity = Obesity::deserialize_bin(&bytes)?;
    println!("{:?}", loaded);
    Ok(())
}