Use TimSort (WebKit you lazy fuck)

Build/lib/stable-sort-domain.bench.ts

@@ -0,0 +1,17 @@
+import { fetchRemoteTextByLine } from './fetch-text-by-line';
+import { getGorhillPublicSuffixPromise } from './get-gorhill-publicsuffix';
+import { processLineFromReadline } from './process-line';
+import { sortDomains } from './stable-sort-domain';
+
+import { bench, group, run } from 'mitata';
+
+(async () => {
+  const data = await processLineFromReadline(await fetchRemoteTextByLine('https://osint.digitalside.it/Threat-Intel/lists/latestdomains.txt'));
+  const gorhill = await getGorhillPublicSuffixPromise();
+
+  group('sortDomains', () => {
+    bench('run', () => sortDomains(data, gorhill));
+  });
+
+  run();
+})();

Build/lib/stable-sort-domain.ts

@@ -1,4 +1,5 @@
 import type { PublicSuffixList } from '@gorhill/publicsuffixlist';
+import { sort } from 'timsort';
 
 const compare = (a: string | null, b: string | null) => {
   if (a === b) return 0;
@@ -50,5 +51,7 @@ export const sortDomains = (inputs: string[], gorhill: PublicSuffixList) => {
     return compare($a, $b) || compare(a, b);
   };
 
-  return inputs.sort(sorter);
+  sort(inputs, sorter);
+
+  return inputs;
 };