In PR #617, try_methods are provided to prevent the panic In PR #628, capacity overflow is resolve but introduce panic Just like implementation in [hashbrown](https://github.com/rust-lang/hashbrown/blob/v0.14.5/src/raw/mod.rs#L195), maybe `to_raw_capacity` can return `Option<usize>` too.
In PR #617, try_methods are provided to prevent the panic
In PR #628, capacity overflow is resolve but introduce panic
Just like implementation in hashbrown, maybe
to_raw_capacitycan returnOption<usize>too.