Just as info for other Nim-novices like me:
It is even possible to call a method at compile time, using procCall and
explicitly casting to the desired type. In my given example, it could be done
like so:
```nim
echo "compiletime procCall : " & $(procCall
MyType(x).intSumDynamic(MyType(y)))
```
This is awesome, because it solves the original problem I was puzzling with
while I encountered the behavior described in my initial post.
