Efficient Integer Palindrome Checker

palindrome.py

def is_palindrome(number: int) -> bool:
    """Return True if number is palindrome integer.
    Designed to be efficient with integers of arbitrary length.
    """
    if number < 0:
        return False
    if number < 10:
        return True
    reversed = 0
    while number > reversed:
        number, rem = divmod(number, 10)
        reversed = reversed * 10 + rem
    # If odd number of digits, ignore final digit in reversed.
    return number == reversed or number == reversed // 10