implement workaround for RPyC problem

[rlehfeld]

This version includes a fix for a problem with RPyC with objects which do not provide the __class__ method, either because it was hidden or it is basically not available e.g. because it is implemented in C.

This solution is only tested with Python3 as all of the library anyway.

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This discussion was created from the release implement workaround for RPyC problem.