* graduate card when user press hard and has 0 learning steps
* fix error: useless conversion to the same type
* do the same thing to again
* fix expected `Option<u32>`, found integer
* ./ninja format
* Update to FSRS-rs v1.2.0
* if else -> match
* Weight length check has been moved into FSRS (dae)
* Don't mention the number of FSRS parameters (dae)
It has changed, and may change again.
* Make hard repeat the current step's interval in v3
Unless for the first step to avoid identical interval with Again.
* Make Hard repeat the current step's interval in v2
* Adjust test to new Hard behaviour
* Fix steps being mistaken for seconds
* Cap steps at `u32::max` seconds
* Fix overflow of steps in Rust
* Prevent overflow of `IntervalKind`
* Prevent overflow in `revlod/mod.rs`
Also replace some `as` with `from` and `try_from` as is recommended to
highlight potential issues.
* Ensure v2 doesn't store overflowing revlog ivls
* Lower steps cap in deck options
Whereas large card intervals are converted to days, revlog intervals use
i32s to store large numbers of seconds.
* Format
