--- a/__init__.py	Wed Oct 22 15:59:52 2014 +0200
+++ b/__init__.py	Fri Oct 17 12:14:58 2014 +0200
@@ -42,7 +42,7 @@
 
 from logilab.common.deprecation import deprecated
 from logilab.common.logging_ext import set_log_methods
-from yams.constraints import BASE_CONVERTERS
+from yams.constraints import BASE_CONVERTERS, BASE_CHECKERS
 
 # pre python 2.7.2 safety
 logging.basicConfig()
@@ -140,6 +140,10 @@
         return cPickle.loads(zlib.decompress(self.getvalue()))
 
 
+def check_password(eschema, value):
+    return isinstance(value, (str, Binary))
+BASE_CHECKERS['Password'] = check_password
+
 def str_or_binary(value):
     if isinstance(value, Binary):
         return value