NaN, Infinity, -Infinity

Author: ijl

README.md

@@ -12,7 +12,8 @@ the standard library.
 It differs in behavior from other Python JSON libraries in supporting
 datetimes, not supporting subclasses without a `default` hook,
 serializing UTF-8 to bytes rather than escaped ASCII (e.g., "好" rather than
-"\\\u597d") by default, having strict UTF-8 conformance, not supporting pretty
+"\\\u597d") by default, having strict UTF-8 conformance, having strict JSON
+conformance on NaN/Infinity/-Infinity, not supporting pretty
 printing, and not supporting all standard library options.
 
 It supports CPython 3.6 and 3.7.
@@ -109,7 +110,8 @@ def loads(obj: Union[bytes, str]) -> Union[dict, list, int, float, str, None]: .
 `loads()` deserializes JSON to Python objects.
 
 It raises `JSONDecodeError` if given an invalid type or invalid
-JSON.
+JSON. This includes if the input contains `NaN`, `Infinity`, or `-Infinity`,
+which the standard library allows, but is not valid JSON.
 
 `JSONDecodeError` is a subclass of `ValueError`. This is for
 compatibility with the standard library.

test/test_type.py

@@ -108,6 +108,22 @@ def test_null_array(self):
         self.assertEqual(orjson.dumps(obj), ref)
         self.assertEqual(orjson.loads(ref), obj)
 
+    def test_nan(self):
+        """
+        NaN is not valid JSON
+        """
+        with self.assertRaises(orjson.JSONDecodeError):
+            orjson.loads('[NaN]')
+
+    def test_infinity(self):
+        """
+        Infinity, -Infinity is not valid JSON
+        """
+        with self.assertRaises(orjson.JSONDecodeError):
+            orjson.loads('[Infinity]')
+        with self.assertRaises(orjson.JSONDecodeError):
+            orjson.loads('[-Infinity]')
+
     def test_int_64(self):
         """
         int  64-bit