_may_promote hotfix.

Author: Rajat Jain

pandas/core/dtypes/cast.py

@@ -535,7 +535,7 @@ def ensure_dtype_can_hold_na(dtype: DtypeObj) -> DtypeObj:
     elif dtype.kind == "b":
         return _dtype_obj
     elif dtype.kind in "iu":
-        return np.dtype(np.float64)
+        return np.dtype(np.int64)
     return dtype
 
 
@@ -625,7 +625,6 @@ def _maybe_promote(dtype: np.dtype, fill_value=np.nan):
         return dtype, fill_value
 
     if is_valid_na_for_dtype(fill_value, dtype) and dtype.kind in "iufcmM":
-        dtype = ensure_dtype_can_hold_na(dtype)
         fv = na_value_for_dtype(dtype)
         return dtype, fv