New tests to validate type safety is preserved
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p3
- Dominant language
- Python
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Description
### What was wrong?
From: https://github.com/ethereum/eth-utils/pull/151
Looks like `flatten_return`, `reversed_return` and `sorted_return` don't do a good job of retaining type safety. It's not easy to write a test for this now.
### How can it be fixed?
Figure out how to easily write tests that demonstrate both positive and negative assertions about mypy checks.
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