It seems like pickling of typing types is broken in 3.5 and 3.6, fixed in 3.7: https://github.com/python/typing/issues/511
Here are my attempts: https://gist.github.com/udim/ec213305ca865390c391001e8778e91d My ideas: 1. I know that we override type object handling in pickler.py (_nested_type_wrapper), and perhaps this mechanism can be used to pickle typing classes correctly. The question is how. 2. Exclude/stub out these classes when pickling a pipeline - they are only used for verification during pipeline construction anyway. This could be a temporary solution for versions 3.5 and 3.6. Any ideas / opinions?
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