Tags for Pull Request (PR) comments:
[o] Optional -> Equivalent solution but it is not necessarily adding more value to the code versus the existing implementation. The PR can be approved without taking any action.
[c] Curiosity -> Side comment, not necessarily relevant for the approval of the PR. The PR can be approved without taking any action.
[r] Required -> The comment has to be addressed / fixed by the PR creator before the PR can be approved.