diff --git a/lib/zipp/__init__.py b/lib/zipp/__init__.py
index d65297b8..161a4fb1 100644
--- a/lib/zipp/__init__.py
+++ b/lib/zipp/__init__.py
@@ -1,3 +1,12 @@
+"""
+A Path-like interface for zipfiles.
+
+This codebase is shared between zipfile.Path in the stdlib
+and zipp in PyPI. See
+https://github.com/python/importlib_metadata/wiki/Development-Methodology
+for more detail.
+"""
+
 import io
 import posixpath
 import zipfile
@@ -37,7 +46,7 @@ def _parents(path):
 def _ancestry(path):
     """
     Given a path with elements separated by
-    posixpath.sep, generate all elements of that path
+    posixpath.sep, generate all elements of that path.
 
     >>> list(_ancestry('b/d'))
     ['b/d', 'b']
@@ -49,9 +58,14 @@ def _ancestry(path):
     ['b']
     >>> list(_ancestry(''))
     []
+
+    Multiple separators are treated like a single.
+
+    >>> list(_ancestry('//b//d///f//'))
+    ['//b//d///f', '//b//d', '//b']
     """
     path = path.rstrip(posixpath.sep)
-    while path and path != posixpath.sep:
+    while path.rstrip(posixpath.sep):
         yield path
         path, tail = posixpath.split(path)
 
@@ -86,69 +100,7 @@ class InitializedState:
         super().__init__(*args, **kwargs)
 
 
-class SanitizedNames:
-    """
-    ZipFile mix-in to ensure names are sanitized.
-    """
-
-    def namelist(self):
-        return list(map(self._sanitize, super().namelist()))
-
-    @staticmethod
-    def _sanitize(name):
-        r"""
-        Ensure a relative path with posix separators and no dot names.
-
-        Modeled after
-        https://github.com/python/cpython/blob/bcc1be39cb1d04ad9fc0bd1b9193d3972835a57c/Lib/zipfile/__init__.py#L1799-L1813
-        but provides consistent cross-platform behavior.
-
-        >>> san = SanitizedNames._sanitize
-        >>> san('/foo/bar')
-        'foo/bar'
-        >>> san('//foo.txt')
-        'foo.txt'
-        >>> san('foo/.././bar.txt')
-        'foo/bar.txt'
-        >>> san('foo../.bar.txt')
-        'foo../.bar.txt'
-        >>> san('\\foo\\bar.txt')
-        'foo/bar.txt'
-        >>> san('D:\\foo.txt')
-        'D/foo.txt'
-        >>> san('\\\\server\\share\\file.txt')
-        'server/share/file.txt'
-        >>> san('\\\\?\\GLOBALROOT\\Volume3')
-        '?/GLOBALROOT/Volume3'
-        >>> san('\\\\.\\PhysicalDrive1\\root')
-        'PhysicalDrive1/root'
-
-        Retain any trailing slash.
-        >>> san('abc/')
-        'abc/'
-
-        Raises a ValueError if the result is empty.
-        >>> san('../..')
-        Traceback (most recent call last):
-        ...
-        ValueError: Empty filename
-        """
-
-        def allowed(part):
-            return part and part not in {'..', '.'}
-
-        # Remove the drive letter.
-        # Don't use ntpath.splitdrive, because that also strips UNC paths
-        bare = re.sub('^([A-Z]):', r'\1', name, flags=re.IGNORECASE)
-        clean = bare.replace('\\', '/')
-        parts = clean.split('/')
-        joined = '/'.join(filter(allowed, parts))
-        if not joined:
-            raise ValueError("Empty filename")
-        return joined + '/' * name.endswith('/')
-
-
-class CompleteDirs(InitializedState, SanitizedNames, zipfile.ZipFile):
+class CompleteDirs(InitializedState, zipfile.ZipFile):
     """
     A ZipFile subclass that ensures that implied directories
     are always included in the namelist.
@@ -329,7 +281,7 @@ class Path:
     >>> str(path.parent)
     'mem'
 
-    If the zipfile has no filename, such attributes are not
+    If the zipfile has no filename, such attributes are not
     valid and accessing them will raise an Exception.
 
     >>> zf.filename = None
@@ -470,8 +422,7 @@ class Path:
         prefix = re.escape(self.at)
         tr = Translator(seps='/')
         matches = re.compile(prefix + tr.translate(pattern)).fullmatch
-        names = (data.filename for data in self.root.filelist)
-        return map(self._next, filter(matches, names))
+        return map(self._next, filter(matches, self.root.namelist()))
 
     def rglob(self, pattern):
         return self.glob(f'**/{pattern}')
diff --git a/lib/zipp/compat/overlay.py b/lib/zipp/compat/overlay.py
new file mode 100644
index 00000000..5a97ee7c
--- /dev/null
+++ b/lib/zipp/compat/overlay.py
@@ -0,0 +1,37 @@
+"""
+Expose zipp.Path as .zipfile.Path.
+
+Includes everything else in ``zipfile`` to match future usage. Just
+use:
+
+>>> from zipp.compat.overlay import zipfile
+
+in place of ``import zipfile``.
+
+Relative imports are supported too.
+
+>>> from zipp.compat.overlay.zipfile import ZipInfo
+
+The ``zipfile`` object added to ``sys.modules`` needs to be
+hashable (#126).
+
+>>> _ = hash(sys.modules['zipp.compat.overlay.zipfile'])
+"""
+
+import importlib
+import sys
+import types
+
+import zipp
+
+
+class HashableNamespace(types.SimpleNamespace):
+    def __hash__(self):
+        return hash(tuple(vars(self)))
+
+
+zipfile = HashableNamespace(**vars(importlib.import_module('zipfile')))
+zipfile.Path = zipp.Path
+zipfile._path = zipp
+
+sys.modules[__name__ + '.zipfile'] = zipfile  # type: ignore[assignment]
diff --git a/lib/zipp/compat/py310.py b/lib/zipp/compat/py310.py
index d5ca53e0..8264a482 100644
--- a/lib/zipp/compat/py310.py
+++ b/lib/zipp/compat/py310.py
@@ -7,5 +7,7 @@ def _text_encoding(encoding, stacklevel=2, /):  # pragma: no cover
 
 
 text_encoding = (
-    io.text_encoding if sys.version_info > (3, 10) else _text_encoding  # type: ignore
+    io.text_encoding  # type: ignore[unused-ignore, attr-defined]
+    if sys.version_info > (3, 10)
+    else _text_encoding
 )
diff --git a/lib/zipp/glob.py b/lib/zipp/glob.py
index 69c41d77..4320f1c0 100644
--- a/lib/zipp/glob.py
+++ b/lib/zipp/glob.py
@@ -28,7 +28,7 @@ class Translator:
         """
         Given a glob pattern, produce a regex that matches it.
         """
-        return self.extend(self.translate_core(pattern))
+        return self.extend(self.match_dirs(self.translate_core(pattern)))
 
     def extend(self, pattern):
         r"""
@@ -41,6 +41,14 @@ class Translator:
         """
         return rf'(?s:{pattern})\Z'
 
+    def match_dirs(self, pattern):
+        """
+        Ensure that zipfile.Path directory names are matched.
+
+        zipfile.Path directory names always end in a slash.
+        """
+        return rf'{pattern}[/]?'
+
     def translate_core(self, pattern):
         r"""
         Given a glob pattern, produce a regex that matches it.