whenOrNull<TResult extends Object?>  method 
- @optionalTypeArgs
A variant of when that fallback to returning null
It is equivalent to doing:
switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}
Implementation
@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( int limit,  String? cursor, @SettingListOptionsScopeConverter()  SettingListOptionsScope? scope,  String? prefix,  List<String>? keys,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _SettingListOptionsInput() when $default != null:
return $default(_that.limit,_that.cursor,_that.scope,_that.prefix,_that.keys,_that.$unknown);case _:
  return null;
}
}