[small-payload.tentative.https.window.html]
  [fetchLater() accepts small payload in a POST request body of String.]
    expected: FAIL

  [fetchLater() accepts small payload in a POST request body of ArrayBuffer.]
    expected: FAIL

  [fetchLater() accepts small payload in a POST request body of FormData.]
    expected: FAIL

  [fetchLater() accepts small payload in a POST request body of URLSearchParams.]
    expected: FAIL

  [fetchLater() accepts small payload in a POST request body of Blob.]
    expected: FAIL

  [fetchLater() accepts small payload in a POST request body of File.]
    expected: FAIL