message: Fix sending of visit variables
diff: @@ -217,7 +217,7 @@ class Analytics {
  ...data,
  url: getRedactedUrl(),
  - _cvar: this.visitVariables, // user custom vars
  + _cvar: JSON.stringify(this.visitVariables), // user custom vars
  res: `${window.screen.width}x${window.screen.height}`, // resolution as WWWWxHHHH
  rand: String(Math.random()).slice(2, 8), // random nonce to cache-bust
  h: now.getHours(),
  