Fix __eq__ _cparts missing (#203)

* tests: add test to check for broken _cparts __eq__
* upath: add UPath._cparts fallback for __eq__ on py<312

Author: ap--

upath/core.py

@@ -516,6 +516,11 @@ def _parts(self):
     def _parts(self, value):
         self.__parts = value
 
+    @property
+    def _cparts(self):
+        # required for pathlib.Path.__eq__ compatibility on Python <3.12
+        return self.parts
+
     # === pathlib.PurePath ============================================
 
     def __reduce__(self):

upath/tests/test_core.py

@@ -248,6 +248,13 @@ def test_copy_path_append():
     assert str(path / "folder2" / "folder3") == str(copy_path)
 
 
+def test_compare_to_pathlib_path_ne():
+    assert UPath("gcs://bucket/folder") != pathlib.Path("gcs://bucket/folder")
+    assert pathlib.Path("gcs://bucket/folder") != UPath("gcs://bucket/folder")
+    assert UPath("/bucket/folder") == pathlib.Path("/bucket/folder")
+    assert pathlib.Path("/bucket/folder") == UPath("/bucket/folder")
+
+
 @pytest.mark.parametrize(
     "urlpath",
     [