I really like get generate model

The JSON returned by the server is sometimes non-standard, such as:

user.json
```
[{
"name": "",
"age": 0,
"discount": 0,
"friends": []
},{
"name": "",
"age": 0,
"discount": 0.0,
"friends": []
}]
```

Run：get generate model on home with assets/models/user.json

output：
```
class User {
String? name;
int? age;
double? discount;
List? friends;

User({this.name, this.age, this.discount, this.friends});

User.fromJson(Map json) {
name = json['name'];
age = json['age'];
discount = json['discount'];
if (json['friends'] != null) {
friends = [];
json['friends'].forEach((v) {
friends?.add(Null.fromJson(v));
});
}
}

Map toJson() {
final data = {};
data['name'] = name;
data['age'] = age;
data['discount'] = discount;
if (friends != null) {
data['friends'] = friends?.map((v) => v.toJson()).toList();
}
return data;
}
}
```

flutter run：
[Error: fluent/runtime/start_vm_initializer. cc (41)] Unhandled Exception: type 'int' is not a subtype of type 'double?'

I will double? Change to num? After solving this problem, how do I mention int when generating the model Double? Unified replacement with num? Type?