They are a pain, but the good thing is a “pocketful of change” can be $40...
I went through Toronto’s airport with over 150 of the dollar coins in my coat (I used to get Canadian coin - including $1 and $2 - for $.30 on the dollar, and traveled there enough to make it worthwhile); as the coat went through the X-ray one of the workers asked me if I knew these coins were in my jacket. I lifted it up and asked them how I couldn’t know; they simply shrugged and waved me through. I also spent about $200 in old paper currency (not in good shape, so it had no collectible value) in a duty-free shop, because they didn’t know if they could change it for fresh notes but were certain I could spend it there. Even the older workers didn’t recognize the bills. Heck, I even changed one of their Olympic sets in a coin shop in Niagara Falls (Ontario) because the face value of the coins had risen so much higher than the silver value, even factoring in the exchange rate (for which I had bought it).