Reddit Repeating Post Filter

Reddit has a bug where the same post can reappear multiple times while scrolling. This script removes those duplicates

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// ==UserScript==
// @name         Reddit Repeating Post Filter
// @description  Reddit has a bug where the same post can reappear multiple times while scrolling. This script removes those duplicates
// @match        https://www.reddit.com/*
// @version      0.1
// @author       mica
// @namespace    greasyfork.org/users/12559
// @license      MIT
// ==/UserScript==

let a = [];
const observer = new MutationObserver(() => {
    if (location.pathname.match(/\/r\/[\w\d]*\/$/) || location.search.includes('?feed')) {
        document.querySelectorAll('a[slot=full-post-link]:not(.checked)').forEach(e => {
            if (a.some(url => e.href.match(url))) {
                e.closest('article').remove();
            } else {
                e.classList.add('checked');
            }
            a.push(e.href);
        })
    }
});
observer.observe(document.body, {
    childList: true,
    subtree: true
});