mycroft, on 2020-January-21, 09:51, said:
Yes - basically this is not only standard but "there can't be another way" in ACBL District 18 (at least the Canadian side of it). Shape rules, and extras are something you work out "later".
Ditto in District 19. To the extent that a stranger has trouble getting good disclosure - the response to "Does 3♣ show extras?" tends to be "Huh?"