Fix issue pandas-dev#47101

Bisecting two years ago ( pandas-dev#47101 (comment) ) shows this regression was introduced in b2d54d9 in 2021. Somehow this hasn't been patched since then.

PR pandas-dev#48313 was supposed to address this, but the PR was closed and never merged and the bug has persisted.

Author: tigerhawkvok

pandas/core/missing.py

@@ -124,11 +124,15 @@ def mask_missing(arr: ArrayLike, values_to_mask) -> npt.NDArray[np.bool_]:
                     new_mask = np.zeros(arr.shape, dtype=np.bool_)
                     new_mask[arr_mask] = arr[arr_mask] == x
                 else:
-                    new_mask = arr == x
+                    # GH#47101 
+                    # Fix where type 'bool' has no attribute 'to_numpy()' by first attempting to broadcast 
+                    # with np.equal for some cases, and then an explicit type check when checking the mask
+                    # for any straggling cases
+                    new_mask = np.equal(arr, x)
 
                     if not isinstance(new_mask, np.ndarray):
                         # usually BooleanArray
-                        new_mask = new_mask.to_numpy(dtype=bool, na_value=False)
+                        new_mask = np.array([new_mask]) if isinstance(new_mask, bool) else new_mask.to_numpy(dtype=bool, na_value=False)
                 mask |= new_mask
 
     if na_mask.any():