@@ -176,11 +176,19 @@ def setlast(self, key, value):
         prior = super(_OMD, self).__getitem__(key)
         prior[-1] = value
 
+    def get(self, key, default=None):
+        return super(_OMD, self).get(key, [default])[-1]
+
     def getall(self, key):
         return super(_OMD, self).__getitem__(key)
 
+    def items(self):
+        """List of (key, last value for key)."""
+        return [(k, self[k]) for k in self]
+
     def items_all(self):
-        return [(k, self.get(k)) for k in self]
+        """List of (key, list of values for key)."""
+        return [(k, self.getall(k)) for k in self]
 
 
 class GitConfigParser(with_metaclass(MetaParserBuilder, cp.RawConfigParser, object)):
@@ -481,14 +489,9 @@ def _write(self, fp):
         git compatible format"""
         def write_section(name, section_dict):
             fp.write(("[%s]\n" % name).encode(defenc))
-            for (key, value) in section_dict.items_all():
+            for (key, values) in section_dict.items_all():
                 if key == "__name__":
                     continue
-                elif isinstance(value, list):
-                    values = value
-                else:
-                    # self._defaults isn't a multidict
-                    values = [value]
 
                 for v in values:
                     fp.write(("\t%s = %s\n" % (key, self._value_to_string(v).replace('\n', '\n\t'))).encode(defenc))
@@ -506,25 +509,19 @@ def items(self, section_name):
 
     def items_all(self, section_name):
         """:return: list((option, [values...]), ...) pairs of all items in the given section"""
-        rv = OrderedDict()
-        for k, v in self._defaults:
-            rv[k] = [v]
+        rv = _OMD(self._defaults)
 
-        for k, v in self._sections[section_name].items_all():
+        for k, vs in self._sections[section_name].items_all():
             if k == '__name__':
                 continue
 
-            if k not in rv:
-                rv[k] = v
-                continue
-
-            if rv[k] == v:
+            if k in rv and rv.getall(k) == vs:
                 continue
 
-            rv[k].extend(v)
+            for v in vs:
+                rv.add(k, v)
 
-        # For consistency with items(), return a list, even in Python 3
-        return list(rv.items())
+        return rv.items_all()
 
     @needs_values
     def write(self):
 
@@ -11,7 +11,7 @@
     GitConfigParser
 )
 from git.compat import string_types
-from git.config import cp
+from git.config import _OMD, cp
 from git.test.lib import (
     TestCase,
     fixture_path,
@@ -362,3 +362,13 @@ def test_add_to_multiple(self):
             self.assertEqual(cr.items_all('section1'),
                              [('option1', ['value1a', 'value1b', 'value1c']),
                               ('other_option1', ['other_value1'])])
+
+    def test_setlast(self):
+        # Test directly, not covered by higher-level tests.
+        omd = _OMD()
+        omd.setlast('key', 'value1')
+        self.assertEqual(omd['key'], 'value1')
+        self.assertEqual(omd.getall('key'), ['value1'])
+        omd.setlast('key', 'value2')
+        self.assertEqual(omd['key'], 'value2')
+        self.assertEqual(omd.getall('key'), ['value2'])