TYP: misc fixes for numpy types 3
```
pandas\core\reshape\merge.py:1931: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
pandas\core\reshape\merge.py:1932: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
pandas\core\reshape\merge.py:1941: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
pandas\core\reshape\merge.py:1950: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
pandas\core\reshape\merge.py:1951: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
pandas\io\pytables.py:5084: error: Incompatible types in assignment (expression has type "ndarray", variable has type "ExtensionArray")  [assignment]
```
pls rebase closing to clear queue. (also need a decision on naming)