Call for testing: Cargo sparse-registry

[notriddle]

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Cargo sparse protocol feedback thread

Cargo's new index protocol will be available starting in Rust 1.68, which will be released on 2023-03-09. This new "sparse" protocol should usually provide a significant performance improvement when accessing crates.io. We would like your help in testing this new feature and infrastructure. If you use beta (1.68) or nightly-2023-01-21 or newer, set the environment variable CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse, or edit your .cargo/config.toml file to add: [registries.crates-io] protocol =…