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Test and fix `size_hint` for slice’s [r]split* iterators by steffahn · Pull Requ...
source link: https://github.com/rust-lang/rust/pull/87974
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Adds extensive test (of size_hint) for all the [r]split* iterators.
Fixes size_hint upper bound for split_inclusive* iterators which was one higher than necessary for non-empty slices.
Fixes size_hint lower bound for [r]splitn* iterators when n == 0, which was one too high.
Lower bound being one too high was a logic error, violating the correctness condition of size_hint.
Edit: I’ve opened an issue for that bug, so this PR fixes #87978
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