Cargo by default saves credentials to .cargo/credentials.toml
#11533
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What does this PR try to resolve?
Cargo team discussed this in the triage meeting and agree that it has been long enough to write to
.cargo/credentials.toml
by default.Fixes #11509.
cc rust-lang/crates.io#5730 rust-lang/crates.io#5732
How should we test and review this PR?
Integration tests included.
Additional information
We also talked about theoretically dropping the support of the old
credentials
for any new features. That might “force” people to migrate, though doing that has low benefits.