Hello Mateusz,
I'm sorry if I gave you the impression that I was trying to tell you what to do. It was more the wonderment why someone would care about such a relatively unimportant thing as a mis-timed playground, which is also far away from his home.
What I do differently is that when someone makes a mistake that as in this case is insignificant, I write to them mapper directly. If someone use OSM's hint system, the person it affects doesn't get a direct message and can't deal with it straight away.
If you find errors that I have made in the future, please write me directly so that I can take care of fixing them.
Thanks Protoxenus
