Refactor

src/framework/helper/random.ts

@@ -2,16 +2,17 @@ export class Random {
   public constructor(private seed: number) {}
 
   public get next(): number {
+    // result is in [0, 1)
     return (
       ((2 ** 31 - 1) & (this.seed = Math.imul(48271, this.seed))) / 2 ** 31
     );
   }
 
   public choose<T>(list: Array<T>): T {
-    return list[this.randomInInterval(0, list.length)];
+    return list[Math.floor(this.randomInInterval(0, list.length))];
   }
 
   public randomInInterval(aClosed: number, bOpen: number): number {
-    return Math.floor((bOpen - aClosed) * this.next) + aClosed;
+    return (bOpen - aClosed) * this.next + aClosed;
   }
 }