My son is very able (not crazily so but working about a year ahead of his peers). He has always found school easy and I've been fine with him not being stretched as he needed to work on his social skills which he is now much better with. However I am starting to worry that he will not learn how to fail. I see this as a really important skill and don't want him coasting and then really struggling (giving up) when he finds something he is challenged by.
How would you address this with his teacher without being 'that' parent?