str.__mod__ can return unicode apparently

src/runtime/str.cpp

@@ -2254,7 +2254,7 @@ void setupStr() {
     str_cls->giveAttr("format", new BoxedFunction(boxRTFunction((void*)strFormat, UNKNOWN, 1, 0, true, true)));
 
     str_cls->giveAttr("__add__", new BoxedFunction(boxRTFunction((void*)strAdd, UNKNOWN, 2)));
-    str_cls->giveAttr("__mod__", new BoxedFunction(boxRTFunction((void*)strMod, STR, 2)));
+    str_cls->giveAttr("__mod__", new BoxedFunction(boxRTFunction((void*)strMod, UNKNOWN, 2)));
     str_cls->giveAttr("__mul__", new BoxedFunction(boxRTFunction((void*)strMul, UNKNOWN, 2)));
     // TODO not sure if this is right in all cases:
     str_cls->giveAttr("__rmul__", new BoxedFunction(boxRTFunction((void*)strMul, UNKNOWN, 2)));

test/tests/str_functions.py

@@ -136,4 +136,3 @@ try:
     print "hello world".index("goodbye")
 except:
     print "threw exception"
-

test/tests/unicode_test.py

@@ -79,3 +79,5 @@ def f(a):
 f(a=1)
 f(**{'a':2})
 f(**{u'a':3})
+
+print repr('%s' % u'') # this gives a unicode object!