Vincent Yu

Thanks! I've modified lines with range iteration to follow your suggestion.

I just noticed that `setindex!(cb::CircularBuffer, item, i)` returns `cb`. This has been the case since the beginning (when `CircularBuffer` was added in v0.4.3) and this PR retains that behavior. But...

@stev47 Thank you for the review. I've made some changes based on your feedback.

Could a maintainer approve the pending workflows? This is ready for merging.