simplify the fix, add issue reference number to corresponding test and tighten the wording in doc whatsnew

Author: funnycrab

pandas/core/categorical.py

@@ -2135,13 +2135,16 @@ def is_dtype_equal(self, other):
             from pandas.core.series import Series
 
             if isinstance(other, Series):
-                other_categorical = other.values
-            else:
-                other_categorical = other
+                other = Categorical(other)
 
+<<<<<<< a581a743fe6740011e4fb0a7031ee92ce57b480b
             return (self.categories.equals(other_categorical.categories) and
                     self.ordered == other_categorical.ordered)
 >>>>>>> BUG: Fix Categorical comparsion with Series of dtype 'category'
+=======
+            return (self.categories.equals(other.categories) and
+                    self.ordered == other.ordered)
+>>>>>>> simplify the fix, add issue reference number to corresponding test and tighten the wording in doc whatsnew
         except (AttributeError, TypeError):
             return False
 

pandas/tests/test_categorical.py

@@ -202,6 +202,7 @@ def test_is_equal_dtype(self):
             CategoricalIndex(c1, categories=list('cab'))))
         assert not c1.is_dtype_equal(CategoricalIndex(c1, ordered=True))
 
+        # GH 16659
         s1 = pd.Series(c1)
         assert c1.is_dtype_equal(s1)
         assert not c2.is_dtype_equal(s1)