QueryAsync cannot insert multiple items and return a single record set.

I want to add multiple records to a table and get back the IDs, something like this:

var addedIDs = await connection.QueryAsync<int>(@"
    insert into myTable (PropA, ProbB)
    output inserted.MyID
    values (@propA, @propB)", 
    items.Select( x => new { propA = x.A, propB = x.B });

That throws an exception from this line:
https://github.com/StackExchange/Dapper/blob/80231b4d2b2391bbb01c2cd7be75fbecfe0c0296/Dapper/SqlMapper.cs#L1686

This appears to be very deliberately applied to stop this from working (including a test in https://github.com/StackExchange/Dapper/commit/bb5a16ce7abc6468da741f33303d2212f2652d60)

It's not clear why this is blocked or what the correct behaviour should be, as I expect multiple records in my result set, so ExecuteAsync is no use - at best I get the last ID added only.

I think this may also be the cause of https://github.com/StackExchange/Dapper/issues/930

Start in Dapper/SqlMapper.cs at the linked line and review the test added in commit bb5a16ce7abc6468da741f33303d2212f2652d60. Compare the behavior of QueryAsync with ExecuteAsync and inspect the related issue #930. Done means the intended multi-row ID behavior is defined and covered by tests without breaking existing parameter handling.