Okay, so I had an object consisting of tables (basically classes) and structs (classes with only scalars as their properties).

I was about to serialize the object with vectors of classes and structs and wrote some nice tests for it wondering why they fail to validate the data after deserialization and why I only got garbage for the vectors of structs whilst the tables worked just fine.

Turns out there is an undocumented function called CreateVectorOfStructs which shall be used for structs instead of the regular CreateVector ...

There go three hours of blaming memory issues and running Valgrind over and over again ...