Index: pyyaml/trunk/lib/yaml/__init__.py
===================================================================
--- pyyaml/trunk/lib/yaml/__init__.py	(revision 133)
+++ pyyaml/trunk/lib/yaml/__init__.py	(revision 135)
@@ -68,5 +68,5 @@
 def dump_all(natives, writer=None, Emitter=Emitter,
         Serializer=Serializer, Representer=Representer,
-        encoding=None, line_break=None, canonical=None,
+        encoding='utf-8', line_break=None, canonical=None,
         indent=None, width=None, allow_unicode=None):
     if writer is None:
@@ -92,5 +92,5 @@
 def safe_dump_all(natives, writer=None, Emitter=Emitter,
         Serializer=Serializer, Representer=SafeRepresenter,
-        encoding=None, line_break=None, canonical=None,
+        encoding='utf-8', line_break=None, canonical=None,
         indent=None, width=None, allow_unicode=None):
     return dump_all(natives, writer, Emitter, Serializer, Representer,