Invalid JSON values are accepted: numbers with trailing dot but only if greater than u64::MAX

[tmpolaczyk]

According to JSON spec, both of these should be errors:

fn main() {
    let x1: Result<serde_json::Value, _> = serde_json::from_str("18446744073709551615.");
    assert!(x1.is_err());
    let x2: Result<serde_json::Value, _> = serde_json::from_str("18446744073709551616.");
    assert!(x2.is_err());
}

Playground

But this is the output, as of serde_json 1.0.88:

thread 'main' panicked at 'assertion failed: x2.is_err()', src/main.rs:5:5

[dtolnay]

Thanks — good catch. I've published a fix in 1.0.89.