refactor(env): remove unnecessary clones #14730
Merged
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What does this PR try to resolve?
This was found during the review of #14701.
Not every environment variable access requires an owned type.
To be precise, most of our usages don't.
How should we test and review this PR?
Refactor only. Should not have any change in behavior.
One drawback is that the fn signatures deviate from
std::env::var{_os}
.