requested edit to comparison method (pandas-dev#27873)

Author: jbrockmendel

pandas/core/ops/__init__.py

@@ -841,13 +841,12 @@ def wrapper(self, other, axis=None):
         ):
             raise ValueError("Lengths must match")
 
-        elif (
-            is_list_like(other)
-            and len(other) != len(self)
-            and not isinstance(other, frozenset)
-        ):
-            # TODO: why are we treating len-1 frozenset differently?
-            raise ValueError("Lengths must match to compare")
+        elif isinstance(other, (np.ndarray, ABCIndexClass, ABCSeries)):
+            # TODO: make this treatment consistent across ops and classes.
+            #  We are not catching all listlikes here (e.g. frozenset, tuple)
+            #  The ambiguous case is object-dtype.  See GH#27803
+            if len(self) != len(other):
+                raise ValueError("Lengths must match to compare")
 
         if is_categorical_dtype(self):
             # Dispatch to Categorical implementation; CategoricalIndex