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Happy new #Rust day! 🎉

https://blog.rust-lang.org/2023/03/09/Rust-1.68.0.html

Cargo's sparse index is stable, AT LAST. Enable it through `~/.cargo/config.toml` or by exporting `CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse`.

The `pin!` macro ships in the standard library. Minimum API level support for Android is now 19 (KitKat).