This stops using `to_string` as a proxy for this now-provided precise API.
This reverts commit b71927224fd9306b2b5bd2b4f8c22268eadfeb6a and bupms the
dependency version in Cargo.toml.
When an exact version is being installed, if we already have that
version from the index, we don't need to update the index before
installing it. Don't do this if it's not an exact version, because the
update may find us a newer version.
This is particularly useful for scripts which unconditionally run
`cargo install some-crate --version=1.2.3`. Before install-update, I
wrote a crate to do this
(https://crates.io/crates/cargo-ensure-installed) which I'm trying to
replace with just `cargo install`, but the extra latency of updating the
index for a no-op is noticeable.
This introduces an interesting edge-case around yanked crates; the
yanked-ness of crates will no longer change on install for exact version
matches which were already downloaded. This feels niche enough to
hopefully not matter...
`cargo install`: Remove orphaned executables.
When a new version of a package is installed that no longer contains an executable from a previous version, this change causes those orphaned executables to also be removed.
I can place this new behavior behind the `install-upgrade` feature gate if anyone is uncomfortable with changing the behavior now.
cc #6797
