Support downcasting of nullable arrays
- [ ] closes #xxxx
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Addressing GH #33013. Supports downcasting of nullable dtypes by transferring elements in extension array to ndarray to avoid TypeError thrown by np.allclose. Enhancement documented on v1.1.0 in the "other enhancements" section. Unit test written in test_to_numeric.

can you merge master and address comments @yixinxiao7 is this still active? Can you merge master and address comments? 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. Closing as stale.