Minor comments tweak

pint/testsuite/test_issues.py

@@ -703,9 +703,9 @@ def test_issue856b(self):
     def test_issue876(self):
         # Same hash must not imply equality.
 
-        # As an implementation detail of CPython, hash(-1) == hash(-2) This test is
-        # useless in potential alternative Python implementations where hash(-1) !=
-        # hash(-2); one would need to find hash collisions specific for each
+        # As an implementation detail of CPython, hash(-1) == hash(-2).
+        # This test is useless in potential alternative Python implementations where
+        # hash(-1) != hash(-2); one would need to find hash collisions specific for each
         # implementation
 
         a = UnitsContainer({"[mass]": -1})

pint/util.py

@@ -327,11 +327,12 @@ def __setstate__(self, state):
 
     def __eq__(self, other):
         if isinstance(other, UnitsContainer):
-            out = UnitsContainer.__hash__(self) == UnitsContainer.__hash__(other)
+            # UnitsContainer.__hash__(self) is not the same as hash(self); see
+            # ParserHelper.__hash__ and __eq__.
             # Different hashes guarantee that the actual contents are different, but
-            # identical hashes give no guarantee of equality
+            # identical hashes give no guarantee of equality.
             # e.g. in CPython, hash(-1) == hash(-2)
-            if not out:
+            if UnitsContainer.__hash__(self) != UnitsContainer.__hash__(other):
                 return False
             other = other._d