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export default function isPalindrome(x: number): boolean {    if (0 <= x && x <= 9) return true;    if (x < 0 || (x % 10 === 0 && x !== 0)) {        return false;    }    const a = String(x);
    const half = Math.floor(a.length / 2);
    for (let i = 0; i <= half; i++) {        if (a[i] !== a[a.length - i - 1]) return false;    }    return true;}