I would like to give some feedback about ...

MIN MAX Problem:

Your result: 5.9

Right result: 5.6 <--- Is this an error?

max(2.2, 5.6, 5.9, key=int)

From: https://checkio.org/mission/min-max/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36