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The InsertWithOutputIntoAsync method does not work correctly

See original GitHub issue

Hi, I wanted to call the InsertWithOutputIntoAsync method with the following request:

 await source.InsertWithOutputIntoAsync(
    targetTable,
    valueFromTargetTable=> valueFromTargetTable,
    otherTable,
    valueFromTargetTable=> new OtherClass
            {
                Id = valueFromTargetTable.Id, 
                Status = 1
            });

But I caught an exception when calling such code:

System.InvalidCastException : Unable to cast object of type 'LinqToDB.Linq.Table`1[OtherTable]' to type 'System.Linq.IQueryable`1[TargetTable]'

When I started looking at the source code, what I saw was that the method has this code (IQueryable<TTarget>)outputTable link to the source: https://github.com/linq2db/linq2db/blob/master/Source/LinqToDB/LinqExtensions.Insert.cs/#L300

Why do you need a type conversion? The semantics of the method allows you to call the code that I have.