Commits on Jul 17, 2022

1. Union types: Support narrowing to Ellipsis (...) cases of Unions …

   After this change, narrowing to `Ellipsis` works similarly with
   regards to narrowing as `None` in `Optional`s
   
   It would be a good followup refactor to delegate some of the logic
   from `is_singleton_type` to the actual mypy types so they could decide
   for themselves if they are representing singleton objects
   
   Fixes: python#13117
   Co-authored-by: Zsolt Cserna <cserna.zsolt@gmail.com>

   

   László Vaskó and csernazs committed Jul 17, 2022
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