Add partial out-of-order check for field lookup

include/simdjson/generic/ondemand/value_iterator-inl.h

@@ -68,7 +68,13 @@ simdjson_warn_unused simdjson_really_inline simdjson_result<bool> value_iterator
   //        ^ (depth 0, index 2)
   //    ```
   //
-  if (!is_open()) { return false; }
+  if (!is_open()) {
+    // If we're past the end of the object, we're being iterated out of order.
+    // Note: this isn't perfect detection. It's possible the user is inside some other object; if so,
+    // this object iterator will blithely scan that object for fields.
+    if (_json_iter->depth() < depth() - 1) { return OUT_OF_ORDER_ITERATION; }
+    return false;
+  }
   if (at_first_field()) {
     has_value = true;