quic: preserve session stats after close

Signed-off-by: manNomi <hanmw110@naver.com>
PR-URL: #64489
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: manNomi

lib/internal/quic/stats.js

@@ -870,7 +870,7 @@ class QuicSessionStats {
   [kFinishClose]() {
     const view = TypedArrayPrototypeSubarray(this.#handle,
                                              this.#offset,
-                                             this.#offset + IDX_STATS_STREAM_COUNT);
+                                             this.#offset + IDX_STATS_SESSION_COUNT);
     this.#handle = new BigUint64Array(view);
     this.#offset = 0;
     this.#disconnected = true;

test/parallel/test-quic-session-stream-lifecycle.mjs

@@ -90,6 +90,8 @@ clientSession.destroy();
 strictEqual(clientSession.destroyed, true);
 strictEqual(clientSession.endpoint, null);
 strictEqual(clientSession.stats.isConnected, false);
+strictEqual(typeof clientSession.stats.cwnd, 'bigint');
+strictEqual(typeof clientSession.stats.streamsIdleTimedOut, 'bigint');
 
 strictEqual(stream.destroyed, true);