NativeFinalizer work around to free pointers in a guaranteed way without ANY native code

main.dart

import 'dart:ffi';
import 'package:ffi/ffi.dart';

void main(List<String> arguments) {
  print('Opening the executable...');
  final lib = DynamicLibrary.executable();
  print('Grabbing `free` function from myself...');
  final free = lib.lookupFunction<Void Function(Pointer), void Function(Pointer)>('free');
  
  const String test = "Hello World!";
  final ptr = test.toNativeUtf8();
  free(ptr);
}