TYP: check_untyped_defs astype_nansafe
```
pandas\core\arrays\integer.py:549: error: Argument "copy" to "astype_nansafe" has incompatible type "None"; expected "bool"
pandas\core\arrays\boolean.py:527: error: Argument "copy" to "astype_nansafe" has incompatible type "None"; expected "bool"
```
LGTM thanks