integrity: add stats

src/progress-stream.js

@@ -21,7 +21,7 @@ class ProgressStream extends TransformStream {
     }
 
     stats() {
-        const duration = Date.now() - this.#startTime;
+        const duration = Date.now() - this.#startTime; // this is not at _stop time because other streams in pipeline might have to be taken into account
         return { startTime: this.#startTime, duration, transferred: this.#transferred };
     }