Allow Heroes to be used in war if upgrading

Alot of people should agree with me on being able to use heroes in clan wars while they're upgrading. So just like how a defense is upgrading for example, an archer tower going to level 11, it will still show up as level 10 in war and still be able to shoot. Heroes should be the exact same. If your barbarian king is going to level 11, it'll be level 10 since it's upgrading and I think you should still be able to use it. Same goes for the archer queen. Implementing this into the game would solve alot of people's fails and also help out with everyone's attacks Th7 and up. If you have anymore ideas about this and agree leave a comment below.