We use GitHub Enterprise at work. So every Pull Request will be reviewed and merged by another developer and in the process they might first give review feedbacks as comments and post we incorporating them the PR will be merged.
Another thing that might help is when time permits go through PR merged by someone else how this helps is :
1) Understand what and how something is implemented.
2) A new pair of eyes looking at them. Might catch some problems missed.
3) sometimes learn a new technique to solve a problem.
Nice approach, thanks for sharing, Adarsh
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