Address review feedback on Constants.__repr__

- Add a release_log.rst bullet for the __repr__ change (#221)
- Fix the scalar-override test to exercise direct assignment, since 8 of
  the 10 tracked scalars aren't __init__ kwargs at all -- only
  patronymic_name_order and middle_name_as_last are
- Add tests for multiple simultaneous scalar overrides and an empty
  collection

Author: derek73

docs/release_log.rst

@@ -41,6 +41,7 @@ Release Log
     - Add international honorifics to ``TITLES`` (#187)
     - Add German/Austrian nobility and ecclesiastical titles to ``TITLES`` (closes #101)
     - Add German/Dutch last-name prefixes and title/degree suffixes; fix ``join_on_conjunctions()`` to register multi-word prefix chains (e.g. ``"von und zu"``) as prefixes, mirroring existing title handling (closes #18)
+    - Change ``Constants.__repr__`` to report collection sizes and non-default scalar config, replacing the uninformative ``<Constants() instance>`` (#221)
 * 1.2.1 - June 19, 2026
     - Fix ``initials()`` interpolating the literal ``None`` for empty name parts when ``empty_attribute_default = None`` (e.g. ``"J. None D."``); empty parts now render as an empty string and a fully-empty result returns ``empty_attribute_default``
     - Add ``python -m nameparser "Name String"`` command-line helper that prints a parsed name

tests/test_constants.py

@@ -538,16 +538,34 @@ def test_repr_omits_scalars_at_default_value(self) -> None:
         for name in Constants._repr_scalar_attrs:
             self.assertNotIn(name, repr_str)
 
-    def test_repr_shows_scalar_override(self) -> None:
+    def test_repr_shows_scalar_override_via_constructor(self) -> None:
         c = Constants(middle_name_as_last=True)
         self.assertIn("middle_name_as_last: True", repr(c))
 
+    def test_repr_shows_scalar_override_via_assignment(self) -> None:
+        # Most _repr_scalar_attrs (e.g. capitalize_name) aren't __init__ kwargs
+        # at all -- they're only ever overridden by direct assignment.
+        c = Constants()
+        c.capitalize_name = True
+        self.assertIn("capitalize_name: True", repr(c))
+
+    def test_repr_shows_multiple_simultaneous_scalar_overrides(self) -> None:
+        c = Constants(patronymic_name_order=True)
+        c.capitalize_name = True
+        repr_str = repr(c)
+        self.assertIn("patronymic_name_order: True", repr_str)
+        self.assertIn("capitalize_name: True", repr_str)
+
     def test_repr_reflects_mutated_collection_size(self) -> None:
         c = Constants()
         before = len(c.titles)
         c.titles.add('a-brand-new-title-for-repr-test')
         self.assertIn(f"titles: {before + 1}", repr(c))
 
+    def test_repr_reports_empty_collection(self) -> None:
+        c = Constants(titles=[])
+        self.assertIn("titles: 0", repr(c))
+
     def test_repr_is_bracketed_multiline(self) -> None:
         repr_str = repr(Constants())
         self.assertTrue(repr_str.startswith("<Constants : [\n"))