Hint that str search results are in bounds

[SomeFlyingThing]

It hints that successful find and rfind return à index in bounds

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[JohnTitor]

Given the branch name I guess you used an LLM for this PR, right? As per https://forge.rust-lang.org/policies/llm-usage.html, we don't generally accept LLM-assisted PRs without prior approval, and it should be for a tiny PR.

[SomeFlyingThing]

Given the branch name I guess you used an LLM for this PR, right? As per https://forge.rust-lang.org/policies/llm-usage.html, we don't generally accept LLM-assisted PRs without prior approval, and it should be for a tiny PR.

Yes a LLM was partially used although I reviewed the changes and made the pr myself