Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(révision 81858)
+++ Objects/unicodeobject.c	(copie de travail)
@@ -1488,11 +1488,15 @@
         encoding = PyUnicode_GetDefaultEncoding();
 
     /* Shortcuts for common default encodings */
-    if (strcmp(encoding, "utf-8") == 0)
-        return PyUnicode_EncodeUTF8(PyUnicode_AS_UNICODE(unicode),
-                                    PyUnicode_GET_SIZE(unicode),
-                                    errors);
-    else if (strcmp(encoding, "latin-1") == 0)
+    if (strcmp(encoding, "utf-8") == 0) {
+        if (errors == NULL || strcmp(errors, "strict") == 0) {
+            return PyUnicode_AsUTF8String(unicode);
+        } else {
+            return PyUnicode_EncodeUTF8(PyUnicode_AS_UNICODE(unicode),
+                                        PyUnicode_GET_SIZE(unicode),
+                                        errors);
+        }
+    } else if (strcmp(encoding, "latin-1") == 0)
         return PyUnicode_EncodeLatin1(PyUnicode_AS_UNICODE(unicode),
                                       PyUnicode_GET_SIZE(unicode),
                                       errors);
@@ -2677,13 +2681,16 @@
 
 PyObject *PyUnicode_AsUTF8String(PyObject *unicode)
 {
+    PyObject *utf8;
     if (!PyUnicode_Check(unicode)) {
         PyErr_BadArgument();
         return NULL;
     }
-    return PyUnicode_EncodeUTF8(PyUnicode_AS_UNICODE(unicode),
-                                PyUnicode_GET_SIZE(unicode),
-                                NULL);
+    utf8 = _PyUnicode_AsDefaultEncodedString(unicode, NULL);
+    if (utf8 == NULL)
+        return NULL;
+    Py_INCREF(utf8);
+    return utf8;
 }
 
 /* --- UTF-32 Codec ------------------------------------------------------- */