How can you convert a dictionary key to an int?

Question

Python

Hello, there is a small script for uploading data from a JSON file.
It works great and loads the information I need into the dictionary, but the fact is that in the dictionary the value of the key should be int, but it turns out something like this (the keys marked with an arrow are my problem):

Script for adding data:

with open('data.json', 'w', encoding='utf-8') as fh:
    fh.write(json.dumps(data, sort_keys=True, indent=4, ensure_ascii=False))

Data loading script:

with open('data.json', 'r', encoding='utf-8') as fh:
       data = json.load(fh)
       for key, value in data.items():
           data[int(key)] = value

Answer 1

Json.dupm() translates keys to str

Answer 2

This is a feature of js, since json is part of it. Possible solutions:
1. If it then goes to js, ​​then use all the same strings or refuse such keys.
2. If only in python, then write your own object_hook or use another format for serialization.