- feat: added `is_error` and `get_error` methods to the `DataType` trait
- feat: add deserializer helper functions
- feat: support get merged region
- feat: add `Range::headers` method
- feat: expose some `Dimensions` methods
- fix: use case insensitive comparison when searching for file in xlsx
- fix: do not panic when reading cell format with invalid index
- chore: use `OnceLock` instead of once_cell crate (MSRV: 1.71)