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If possible, before the review, talk to the requester for 5 minutes to get a bit of a preview of the code. This helps you get a mental understanding of what you are reviewing.
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Teach, don't just tell. Reviewing a PR shouldn't JUST be about code safety, but also an opportunity to mentor as well.
- Don't forget to praise concise/readable/efficient/elegant code.
- Remember that you are reviewing another human's code. Ask, don't tell.