I believe the implication is that when he wrote the code it compiled just fine. There were no reentrant mutexes, so one can assume the database connection he wa

I believe the implication is that when he wrote the code it compiled just fine. There were no reentrant mutexes, so one can assume the database connection he was working with conformed to Send at that point, and it was only with the addition of the reentrant mutexes that the connection lost the conformance to Send.