Function f64_compression_ratio

nodedb-codec/src/pcodec.rs:167–182

()

    #[test]
    fn f64_compression_ratio() {
        // Pcodec should compress numerical data better than raw.
        let mut values = Vec::with_capacity(10_000);
        let mut rng: u64 = 42;
        for _ in 0..10_000 {
            rng = rng.wrapping_mul(6364136223846793005).wrapping_add(1);
            values.push(((rng >> 33) as f64 / (u32::MAX as f64)) * 1000.0);
        }
        let encoded = encode_f64(&values).unwrap();
        let raw_size = values.len() * 8;
        let ratio = raw_size as f64 / encoded.len() as f64;
        assert!(
            ratio > 1.1,
            "pcodec should compress random-ish floats >1.1x, got {ratio:.2}x"
        );
    }

    #[test]
    fn i64_empty() {