Mainstream databases like Postgres and SQL server (and MySQL too I think) all return type information with their results. Having written wire protocol clients f

Mainstream databases like Postgres and SQL server (and MySQL too I think) all return type information with their results. Having written wire protocol clients for these, I flat out reject your claim that SQL isn't typed at the results level. It's one of the few places in common usage that the types are explicitly stated. Whether or not your client libraries reflect that is a different issue (and if they don't, I encourage you to use something better).