HaxeでluaのネイティブコードにArrayを公開するときの作法

@:expose
class Sample {
    static function main(): Array<Int> {
        return [10, 20, 30];
    }
}

fromHaxe = require 'sample'

print('native')
local a = { 10, 20, 30 }
for i, m in ipairs(a) do
  print(string.format("%d: %s", i, m))
end

print('from haxe')
local b = fromHaxe.Sample.main()
for i, m in ipairs(b) do
  print(string.format("%d: %s", i, m))
end

haxe -main Sample -lua sample.lua && lua sample2.lua
native
1: 10
2: 20
3: 30
from haxe
1: 20
2: 30

#if lua
return lua.Table.fromArray(data);
#else
return data;
#end

import lua.Table;
import lua.PairTools;

@:forward abstract LuaArray<T>(Table<Int, T>) from Table<Int, T> to Table<Int, T> {
  @:from static inline function fromArray<T>(array: Array<T>): LuaArray<T> {
    return Table.fromArray(array);
  }

  @:to function toArray(): Array<T> {
    final array = new Array<T>();
    PairTools.ipairsEach(this, function(index, element) {
      array.push(element);
    });
    return array;
  }
}

static function main2(): LuaArray<Int> {
  var data = [10, 20, 30]; // Array<int>
  return data;
}