function deep(o, stack) {
  const BREAK_STACK = 10;
  if(stack > BREAK_STACK) return
  let obj = {};
  stack = stack || 0;
  for(let a in o) {
    let item = o[a];

    if(Array.isArray(item))
    {
      let c = [];
      for(let i = 0; i < item.length; i++) {
        c[i] = item[i];
      }
      obj[a] = c;
    }
    else if(typeof item === "object")
      obj[a] = deep(o[a], stack + 1);
    else
      obj[a] = item;
  }
  return obj;
}