Python 3.9 - Swapped '__eq__()'-function call for membership operator "in"

[elmax0]

In Python 3.9 the "in"-operator apparently changed the __eq__() function call so that:

x in y will check for every element e in y if e.__eq__(x)

The documentation says otherwise but testing and debugging showed, that it doesn't work properly like intended.

This may cause the add_observer()function in base.py line 124 to break when trying to connect two modules.

To make it work in Python 3.9, line 150 in base.py has to be changed like:
if topic in sink.input_topics: -> if any(topic is e or topic == e for e in sink.input_topics):

Needs to be checked for higher versions too!

[elmax0]

Occurs when e.g.:
a source (or processor) with output_topics = [Topic(name='random', dtype=int)] connects to a
processor (or sink) with input_topics = [Topic(dtype=int)]