Making unofficial reviews before you become a reviewer is encouraged. This is an excellent way to show your skills. Note that you should not put r+ nor r- on patches in such unofficial reviews.
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I guess this wan’t updated after the move to GitHub. For me, no r+ or r- on bugzilla translates to no approve / deny PRs on GitHub. So I simply wish we’d start enforcing this policy again.
Having the tools help us would be great but I don’t think it stops us from enforcing our own policies like we used to.