Fix crashes, leaks and lost errors in the C extension

HISTORY.rst

@@ -3,6 +3,29 @@
 History
 -------
 
+3.3.0
+++++++++++++++++++
+
+* A second ``__init__`` on a pure Python ``Reader`` now closes the old
+  database, and an iterator from before it raises ``ValueError``, as in the
+  C extension. Before, the iterator walked the new database with node
+  numbers from the old one. A failed ``__init__`` keeps the old database.
+  After ``close()``, an iterator raises ``ValueError`` in every mode.
+* C extension:
+
+  * Fixed segmentation faults from invalid use of ``Metadata``, ``Reader`` and
+    the internal iterator type.
+  * Fixed a segmentation fault on a database with a map key that is not a
+    string. Such a database now raises ``InvalidDatabaseError``.
+  * Fixed large ``uint32`` values, which came back negative on platforms
+    with a 32-bit C ``long``, such as Windows.
+  * Fixed memory leaks and a use-after-free. A second ``__init__`` on a
+    ``Reader`` now closes the old database, and an iterator from before it
+    raises ``ValueError``. A failed ``__init__`` keeps the old database.
+    Reinitializing a ``Metadata`` changes nothing.
+  * Fixed a ``RuntimeWarning`` or ``RuntimeError`` on free-threaded Python on
+    macOS when a ``Reader`` failed to open or was used without ``__init__``.
+
 3.2.0 (2026-09-10)
 ++++++++++++++++++