Optional elements of the same type in sequence get wrong types

[ocktowen]

When there are several optional elements of the same type defined in a sequence (and in a choice) at the moment they are converted to json or dict they have the same data, and when converted to xml they are all of the same type.

Reproduction in this repo

[tefra]

Can you please post here a minimal example, its not easy to spot the issue in the repo