Renaming `kebab-case` cdylib target to `kebab_case` in metadata breaks cargo subcommands

Problem

Hi!

Previously for targets (possibly just cdylib targets?), cargo would emit an artifact.target.name that matched the name of the package! Now it uses the underscored name. This broke cargo-pgrx on beta, and it appears that it or a related change has broken at least one other cargo tool. I believe the breaking change is in the range of https://github.com/rust-lang/cargo/compare/7bb7b539...54d8815d04fa3816edc207bbc4dd36bf18014dbc since it appears on beta but not stable, for me.

I discovered this while hunting another bug or I would have figured it out much faster. As-is, it took me a while to narrow down this problem from amidst my other issues. If I can I will try to fix my other problems and bisect this to a specific cargo commit but I have a lot going on right now so! Though, maybe I will get lucky and this will somehow be the same issue?

It would be nice if this was publicized much more loudly but it doesn't seem to be in the CHANGELOG at that point in time. It might also be nice if I had other ways of finding the mapping of target -> output .so, .dylib, or .dll name than rummaging through the compiler's output messages or randomly picking over the output directory! I don't think I've ever seen documentation promising a particular output format...

If it's relevant, just to make things more confusing, this is a library that is both an rlib and cdylib!

Steps

No response

Possible Solution(s)

No response

Notes

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Version

$ cargo --version --verbose
cargo 1.78.0-beta.4 (54d8815d0 2024-03-26)
release: 1.78.0-beta.4
commit-hash: 54d8815d04fa3816edc207bbc4dd36bf18014dbc
commit-date: 2024-03-26
host: x86_64-unknown-linux-gnu
libgit2: 1.7.2 (sys:0.18.2 vendored)
libcurl: 8.6.0-DEV (sys:0.4.72+curl-8.6.0 vendored ssl:OpenSSL/1.1.1w)
ssl: OpenSSL 1.1.1w  11 Sep 2023
os: Arch Linux Rolling Release [64-bit]

Start by comparing Cargo behavior between commits 7bb7b539 and 54d8815d04fa3816edc207bbc4dd36bf18014dbc, focusing on artifact.target.name for packages containing both rlib and cdylib targets. Reproduce the breakage in a cargo subcommand and verify that target names remain usable for locating the emitted .so, .dylib, or .dll files.