fixup

Author: kernc

pandas/core/internals.py

@@ -1760,14 +1760,14 @@ def putmask(self, mask, new, align=True, inplace=False, axis=0,
         """
         inplace = validate_bool_kwarg(inplace, 'inplace')
 
-        new_values, _, new, _ = self._try_coerce_args(self.values, new)
+        # use block's copy logic.
         # .values may be an Index which does shallow copy by default
-        if not inplace:
-            new_values = new_values.copy(deep=True)
+        new_values = self.values if inplace else self.copy().values
+        new_values, _, new, _ = self._try_coerce_args(new_values, new)
 
         if is_sparse(new_values):
             indexer = mask.to_dense().values.ravel().nonzero()[0]
-            block = self.copy().setitem(indexer, new)
+            block = self.setitem(indexer, new)
             return [block]
 
         if isinstance(new, np.ndarray) and len(new) == len(mask):