Sorry for the sarcastic reply above (which I just deleted), but I don't see the point of adding parentheses to these calls.

I was reacting to a comment on my pull request #5096 where it was suggested for the new code to have parenthesis. While obviously it's not required, it would at least make sense to use a coherent style throughout the stdlib.
But of course, this is just about calls to one single method.

So well, I don't really care either way. But maybe there are some other thoughts about this?

I don't think every comment out there needs to be turned into a PR. In fact, I'd advise against that given that without first discussing it (preferably in the mailing list)

I think we can close this. There's no 👍 yet. I understand that sometimes parentheses are used and sometimes not, many times I thought maybe we should just force parentheses so it's all consistent, but then we'd have to write property(:x) and such. So in the end it's a matter of style, and sometimes using parentheses and sometimes not is OK, it's just a small syntax detail.