Re-clarify traditional dbm backend types and drop dumb bytearray test

Author: furkanonder

Doc/library/dbm.rst

@@ -130,13 +130,10 @@ Key and Value Types
 The accepted types for keys and values vary by backend. Keys and values are
 handled identically:
 
-* **Traditional backends**:
-
-  * :mod:`dbm.gnu` and :mod:`dbm.ndbm`: Accept :class:`str` and :class:`bytes` objects
-  * :mod:`dbm.dumb`: Accepts :class:`str`, :class:`bytes`, and :class:`bytearray` objects
+* **Traditional backends**: :mod:`dbm.gnu`, :mod:`dbm.ndbm`, and :mod:`dbm.dumb` accept :class:`str` and :class:`bytes` objects.
 * **SQLite backend** (:mod:`dbm.sqlite3`): Accepts :class:`str`, :class:`bytes`,
   :class:`int`, :class:`float`, :class:`bool`, :class:`bytearray`,
-  :class:`memoryview`, and :class:`array.array` objects
+  :class:`memoryview`, and :class:`array.array` objects.
 
 **Storage Format:**
 

Lib/test/test_dbm_dumb.py

@@ -130,13 +130,6 @@ def test_str_write_contains(self):
                              self._dict['\u00fc'.encode('utf-8')])
             self.assertEqual(f[b'1'], b'a')
 
-    def test_bytearray(self):
-        with contextlib.closing(dumbdbm.open(_fname, 'n')) as f:
-            f['key'] = bytearray(b'bytearray_value')
-            self.assertEqual(f[b'key'], b'bytearray_value')
-            f[bytearray(b'bytearray_key')] = b'value'
-            self.assertEqual(f[b'bytearray_key'], b'value')
-
     def test_line_endings(self):
         # test for bug #1172763: dumbdbm would die if the line endings
         # weren't what was expected.