B doesn&#x27;t send the same message, there are too many weasel words, and rather than being polite, comes off as giving the other person authority. I think.<p>Here&#x27;s how I would phrase it: &quot;Thanks for the patch. How does your code deal with condition X? We&#x27;re a big project that needs to consider the needs of users under many different circumstances, so even if it seems like X only happens in 1 out of every 10,000 cases, that means it happens every five minutes to one of our users somewhere in the world.&quot;<p>The idea is that you know the contributor didn&#x27;t check for X, but you&#x27;re giving them the option of saving face. You just asked them whether they considered such a condition and explained why it might be important.<p>Edit: and if they <i>did</i> consider X, they can explain why their solution is okay. You could be wrong in thinking that it&#x27;s not.