Silly double in dart

numbering.dart

class Numbering {
  final double d;
  Numbering({
    required this.d,
  });
  factory Numbering.fromMap(Map<String, dynamic> map) {
    return Numbering(
      d: map['d'], // will error on flutter and working on dartpad
    );
  }
}

void main() {
  final Map<String, dynamic> data = {"d": 0};
  final n= Numbering.fromMap(data);
  print(n.d.runtimeType); //working in dartpad, but this runtimeType will change to int. :-D
}