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Since dynamic-rest is using modern Py3 interpreters - we can now remove "six" package from lib and replace it with Py3 methods
plus: fixed some potent bug in file dynamic_rest/routers.py line 332
fields = getattr(serializer, 'get_link_fields', lambda: [])() to
fields = getattr(serializer, 'get_link_fields', lambda: {})()
because further line 340 use "fields" as dict