Intervals are clamped to 256 days

[Bastian]

I'm not sure if this intentional or a bug, but looking at the code, it seems like review intervals are currently clamped to 256 days.

At least for me, this is unexpected for FSRS and should be configurable or at least mentioned somewhere in the README.

hashcards/src/types/performance.rs

Lines 38 to 39 in f19682b

	/// The maximum review interval in days.
	const MAX_INTERVAL: f64 = 256.0;

hashcards/src/types/performance.rs

Lines 100 to 103 in f19682b

	let interval_clamped: Interval = interval_rounded.clamp(MIN_INTERVAL, MAX_INTERVAL);
	let interval_days: i64 = interval_clamped as i64;
	let interval_duration: Duration = Duration::days(interval_days);
	let due_date: Date = Date::new(today + interval_duration);

[eudoxia0]

Yes. This should be 1) documented and 2) customizable.