query param starts with $ tries string interpolation

[dickermoshe]

// coverage:ignore-file
// GENERATED CODE - DO NOT MODIFY BY HAND
// ignore_for_file: type=lint, unused_import

import 'package:freezed_annotation/freezed_annotation.dart';

import 'child.dart';

part 'adult.freezed.dart';
part 'adult.g.dart';

/// A representation of an adult
@Freezed()
class Adult with _$Adult {
  const factory Adult({
    /// Incorrect name has been replaced. Original name: `$_type`.
    @JsonKey(name: '$_type') // <<< Tries to find a variable _type
    String? object0,
    String? lastName,
    String? firstName,
    List<Child>? children,
  }) = _Adult;

  factory Adult.fromJson(Map<String, Object?> json) => _$AdultFromJson(json);
}

[dickermoshe]

Fixed by #198