ReplyKeyboardMarkup: __init__() got an unexpected keyword argument 'conf'

[nacknime-official]

• Operating System: Linux
• Python Version: 3.8.2
• aiogram version: 2.8
• aiohttp version: 3.6.2
• uvloop version (if installed): Not installed

Expected Behavior

I wanna put a reply keyboard object into the redis storage, but it's impossible. I saw to_python() method of the ReplyKeyboardMarkup object and decided that I'll use that method to serialize the object in the redis storage and I'll use to_object(data) method to get the keyboard from the redis storage and back it to object.

Current Behavior

If I use the KeyboardButton object for ReplyKeyboarkMarkup.add() method, it'll return an error when I do to_object()
If I don't use that and just put a string into ReplyKeyboarkMarkup.add() method, it'll works fine without any error.

Failure Information (for bugs)

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/aiogram/types/base.py", line 145, in to_object
    return cls(**data)
  File "/usr/lib/python3.8/site-packages/aiogram/types/reply_keyboard.py", line 35, in __init__
    super(ReplyKeyboardMarkup, self).__init__(keyboard=keyboard, resize_keyboard=resize_keyboard,
  File "/usr/lib/python3.8/site-packages/aiogram/types/base.py", line 91, in __init__
    self.props[key].set_value(self, value, parent=self)
  File "/usr/lib/python3.8/site-packages/aiogram/types/fields.py", line 56, in set_value
    value = self.deserialize(value, parent)
  File "/usr/lib/python3.8/site-packages/aiogram/types/fields.py", line 161, in deserialize
    row_result.append(deserialize(item, parent=parent))
  File "/usr/lib/python3.8/site-packages/aiogram/types/fields.py", line 112, in deserialize
    return self.base_object(conf={'parent': parent}, **value)
TypeError: __init__() got an unexpected keyword argument 'conf'

Steps to Reproduce

Just execute this code:

from aiogram import types

buttons = ['текст', 'текст', 'текст', 'текст', 'текст', 'текст','текст', 'текст','текст', 'текст', 'текст', 'текст','текст', 'текст']

markup = types.ReplyKeyboardMarkup(row_width=4, resize_keyboard=True)
markup.add(types.KeyboardButton('текст'))
markup.add(types.KeyboardButton('текст'))
markup.add(*buttons)  # or *(types.KeyboardButton(i) for i in buttons), no matter
dict_kb = markup.to_python()

types.ReplyKeyboardMarkup.to_object(dict_kb) # error

but

markup.add('текст')
markup.add('текст')
markup.add(*buttons)
dict_kb = markup.to_python()

types.ReplyKeyboardMarkup.to_object(dict_kb)

works fine