Stable unexpected results (1): 
  ▶ OK /beacon/beacon-basic.https.window.html
  │   ▶ FAIL [expected PASS] Payload size restriction should be accumulated: type = string
  │   │   → assert_false: expected false got true
  │   │ FAIL [expected PASS] Payload size restriction should be accumulated: type = arraybuffer
  │   │   → assert_false: expected false got true
  │   │ 
  │   │ @https://web-platform.test:8443/beacon/beacon-basic.https.window.js:90:17
  │   │ parallelPromiseTest/<@https://web-platform.test:8443/beacon/beacon-common.sub.js:86:21
  │   │ Test.prototype.step@https://web-platform.test:8443/resources/testharness.js:2869:25
  │   │ async_test@https://web-platform.test:8443/resources/testharness.js:681:34
  │   │ parallelPromiseTest@https://web-platform.test:8443/beacon/beacon-common.sub.js:85:13
  └   └ @https://web-platform.test:8443/beacon/beacon-basic.https.window.js:80:22