This is an optional dependency of jiff that embeds the entire IANA Time Zone
Database into the compiled binary only on specific platforms. Specifically, it
embeds the binary TZif for each time zone.
The platforms for which this embeds the data are controlled via the Jiff dependency on this crate. Namely, this crate merely serves as a target dependent proxy. It exists because target specific Cargo features don't exist.
The idea is that this crate is an optional dependency that is enabled by default, but due to its target specific nature, it is only enabled for specific platforms that lack a system copy of the IANA Time Zone Database (i.e., Windows).