generalize serializing scheme

[PythonFZ]

To avoid issues when e.g. de-serializing a dict {"Path": "this is some string"} which should return a dict and not a Path object,
it would be possible to serialize all objects to the dict {<type>: val} which would yield{"dict": {"Path": "this is some string"}} and therefore can not be confused with {"Path": "this is some string"}.