First pass at serializer repr bug

rest_framework/utils/representation.py

@@ -2,6 +2,7 @@
 Helper functions for creating user-friendly representations
 of serializer classes and serializer fields.
 """
+from __future__ import unicode_literals
 from django.db import models
 from django.utils.encoding import force_text
 from django.utils.functional import Promise
@@ -24,7 +25,7 @@ def smart_repr(value):
     if isinstance(value, Promise) and value._delegate_text:
         value = force_text(value)
 
-    value = repr(value)
+    value = repr(value).decode('utf-8')
 
     # Representations like u'help text'
     # should simply be presented as 'help text'

tests/test_serializer.py

+# coding: utf-8
 from __future__ import unicode_literals
 from rest_framework import serializers
 import pytest
@@ -197,3 +198,19 @@ class TestIncorrectlyConfigured:
             "The serializer field might be named incorrectly and not match any attribute or key on the `ExampleObject` instance.\n"
             "Original exception text was:"
         )
+
+
+class TestUnicodeRepr:
+    def test_unicode_repr(self):
+        class ExampleSerializer(serializers.Serializer):
+            example = serializers.CharField()
+
+        class ExampleObject:
+            def __init__(self):
+                self.example = '한국'
+            def __repr__(self):
+                return self.example.encode('utf8')
+
+        instance = ExampleObject()
+        serializer = ExampleSerializer(instance)
+        repr(serializer)