Every 182 I have ever flown has most definitely told me it is unhappy when approaching CLmax.
Depends what you mean by "unhappy". You could fly mine all day long just slightly below the indicated stall speed (well, not actually, because the engine would overheat - but the airframe would be fine with it). The controls are very mushy and you have to fly very delicately - but that's what you'd expect. I guess that's a reasonable definition of "unhappy". But it's perfectly doable. Just I'd prefer not to be doing it that close to the ground.