json deser from Value adjusted to be equal to deser from strings

serde_json/src/value.rs

@@ -722,6 +722,15 @@ impl de::Deserializer for Deserializer {
         }
     }
 
+    #[inline]
+    fn visit_newtype_struct<V>(&mut self,
+                               _name: &'static str,
+                               mut visitor: V) -> Result<V::Value, Self::Error>
+        where V: de::Visitor,
+    {
+        visitor.visit_newtype_struct(self)
+    }
+
     #[inline]
     fn format() -> &'static str {
         "json"