XZ labels, extensions, and option metadata.
This crate is part of the `use-archive` facade workspace. It describes xz/lzma-related labels and options only. It does not compress, decompress, read xz streams, or write xz streams.
```rust
use use_xz::{XzCheckType, XzOptions, XZ_EXTENSION};
let options = XzOptions::default().with_check_type(XzCheckType::Crc64);
assert_eq!(XZ_EXTENSION, "xz");
assert_eq!(options.check_type, XzCheckType::Crc64);
```