The parameter your_type && opponent_type is given, so it is guaranteed that there will always be an opponent unless stated otherwise. And when the description did not say to round, then don't round. ~~

Yes it is. Note here it is 3.6 not 3.8 if that makes any difference. Take a look at this

if there is no opponent and what should be done should be stated in the description

What do you mean by "no opponent"?