CLN: Verify non-ndarray is an ExtensionArray in hash_array GH42003
Closes #42003 
Hello @TheNeuralBit! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:



There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2021-06-14 20:31:18 UTC This pull request is stale because it has been open for thirty days with no activity. Please update or respond to this comment if you're still interested in working on this. Thanks for the PR, but it appears it has gone stale and needs to address the review. Closing but happy to reopen if you're still interested in continuing.