Drop 0.9-era date helper re-exports from the top-level webob package

CHANGES.txt

@@ -74,6 +74,25 @@ Backwards Incompatibilities
 
 - Drop support for Python 2.7, 3.4, 3.5, 3.6, 3.7, 3.8 and 3.9
 
+- The date helpers ``parse_date``, ``parse_date_delta``, ``serialize_date``,
+  ``serialize_date_delta`` and ``timedelta_to_seconds`` are no longer
+  re-exported from the top-level ``webob`` package. They moved to
+  ``webob.datetime_utils`` in WebOb 0.9.7 and have been re-exported from
+  ``webob`` for backwards compatibility ever since, but were never documented
+  or listed in ``webob.__all__``. Import them from ``webob.datetime_utils``
+  instead.
+
+  The ``UTC`` tzinfo object and the ``year``, ``month``, ``week``, ``day``,
+  ``hour``, ``minute`` and ``second`` timedelta constants are unaffected and
+  remain importable from ``webob``.
+
+- ``BaseRequest`` is now listed in ``webob.__all__``. It was already
+  importable from ``webob``, but its absence from ``__all__`` meant type
+  checkers would reject ``from webob import BaseRequest`` once WebOb ships a
+  ``py.typed`` marker.
+
+  See https://github.com/Pylons/webob/issues/457
+
 Experimental Features
 ~~~~~~~~~~~~~~~~~~~~~
 

src/webob/__init__.py

@@ -1,15 +1,10 @@
-from webob.datetime_utils import (  # noqa: F401
+from webob.datetime_utils import (
     UTC,
     day,
     hour,
     minute,
     month,
-    parse_date,
-    parse_date_delta,
     second,
-    serialize_date,
-    serialize_date_delta,
-    timedelta_to_seconds,
     week,
     year,
 )
@@ -18,6 +13,7 @@
 from webob.util import html_escape
 
 __all__ = [
+    "BaseRequest",
     "Request",
     "Response",
     "UTC",