Don't floatify the instance in minimum/maximum messages.

jsonschema/_validators.py

@@ -76,12 +76,11 @@ def minimum(validator, minimum, instance, schema):
     if not validator.is_type(instance, "number"):
         return
 
-    instance = float(instance)
     if schema.get("exclusiveMinimum", False):
-        failed = instance <= minimum
+        failed = float(instance) <= minimum
         cmp = "less than or equal to"
     else:
-        failed = instance < minimum
+        failed = float(instance) < minimum
         cmp = "less than"
 
     if failed:
@@ -94,12 +93,11 @@ def maximum(validator, maximum, instance, schema):
     if not validator.is_type(instance, "number"):
         return
 
-    instance = float(instance)
     if schema.get("exclusiveMaximum", False):
-        failed = instance >= maximum
+        failed = float(instance) >= maximum
         cmp = "greater than or equal to"
     else:
-        failed = instance > maximum
+        failed = float(instance) > maximum
         cmp = "greater than"
 
     if failed:

jsonschema/tests/test_validators.py

@@ -141,6 +141,14 @@ class TestValidationErrorMessages(unittest.TestCase):
         message = self.message_for(instance=1, schema=schema)
         self.assertEqual(message, "1 is not of type %r" % (name,))
 
+    def test_minimum(self):
+        message = self.message_for(instance=1, schema={"minimum" : 2})
+        self.assertEqual(message, "1 is less than the minimum of 2")
+
+    def test_maximum(self):
+        message = self.message_for(instance=1, schema={"maximum" : 0})
+        self.assertEqual(message, "1 is greater than the maximum of 0")
+
     def test_dependencies_failure_has_single_element_not_list(self):
         depend, on = "bar", "foo"
         schema = {u"dependencies" : {depend : on}}