Re: [whatwg/url] Investigate aligning application/x-www-form-urlencoded with URL's query (#18)

@annevk Both Firefox and Chrome escape \r and \n to "%0D%0A" when form submitting, should this spec align with them?
screenshot: 
![](http://img.alicdn.com/tps/i1/TB12UBcJVXXXXcMXXXXdoWgTFXX-1180-1468.png)

test script:
```
for (let i = 0; i < 128; i++) {
  let iframe = document.createElement("iframe")
  iframe.src = navigator.vendor === "Google Inc." ? "/" : "data:text/html,bar"
  iframe.onload = function() {
    iframe.contentDocument.body.innerHTML = `
      <form id=form>
        <textarea id=textarea name=name></textarea>
      </form>
    `
    let char = String.fromCodePoint(i)
    iframe.contentWindow.textarea.value = char
    iframe.onload = function() {
      let htmlFormEncoded = iframe.contentWindow.location.href.split("name=")[1]
      let paramsObject = new URLSearchParams()
      paramsObject.set("", char)
      let URLSearchParamsSerialized = paramsObject.toString().slice(1)
      if (htmlFormEncoded !== URLSearchParamsSerialized) {
        console.error(`${URLSearchParamsSerialized} vs ${htmlFormEncoded}`)
      }
    }
    iframe.contentWindow.form.submit()
  }
  document.body.appendChild(iframe)
}

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