There is a curious process: take a number, add its digit-reversed form, and repeat. Write a function is_lychrel that returns True if no palindrome appears after max_iter iterations, treating the number as a Lychrel candidate. If a palindrome appears earlier, return False. Checking a palindrome is easy by comparing a string with its reverse.

def is_lychrel(n: int, max_iter: int) -> bool: