don't, make a copy of input array, instead shuffle it in PseudoRandom.shuffleArray

src/core/PseudoRandom.ts

@@ -108,14 +108,11 @@ export class PseudoRandom {
    * Returns a shuffled copy of the array using Fisher-Yates algorithm.
    */
   shuffleArray<T>(array: T[]): T[] {
-    // Create a copy to avoid modifying the original array
-    const arrayCopy = [...array];
-
-    for (let i = arrayCopy.length - 1; i >= 0; i--) {
+    for (let i = array.length - 1; i >= 0; i--) {
       const j = this.nextInt(0, i + 1);
-      [arrayCopy[i], arrayCopy[j]] = [arrayCopy[j], arrayCopy[i]];
+      [array[i], array[j]] = [array[j], array[i]];
     }
 
-    return arrayCopy;
+    return array;
   }
 }