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Example of Values is not working for stimulus 2.0.0

See original GitHub issue

Hello, I am using stimulus with rails and webpacker.

package.json:

"stimulus": "^2.0.0",

yarn.lock:

"@stimulus/core@^2.0.0":
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/@stimulus/core/-/core-2.0.0.tgz#140c85318d6a8a8210c0faf182223b8459348877"
  integrity sha512-ff70GafKtzc8zQ1/cG+UvL06GcifPWovf2wBEdjLMh9xO2GOYURO3y2RYgzIGYUIBefQwyfX2CLfJdZFJrEPTw==
  dependencies:
    "@stimulus/mutation-observers" "^2.0.0"

"@stimulus/multimap@^2.0.0":
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/@stimulus/multimap/-/multimap-2.0.0.tgz#420cfa096ed6538df4a91dbd2b2842c1779952b2"
  integrity sha512-pMBCewkZCFVB3e5mEMoyO9+9aKzHDITmf3OnPun51YWxlcPdHcwbjqm1ylK63fsoduIE+RowBpFwFqd3poEz4w==

"@stimulus/mutation-observers@^2.0.0":
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/@stimulus/mutation-observers/-/mutation-observers-2.0.0.tgz#3dbe37453bda47a6c795a90204ee8d77a799fb87"
  integrity sha512-kx4VAJdPhIGBQKGIoUDC2tupEKorG3A+ckc2b1UiwInKTMAC1axOHU8ebcwhaJIxRqIrs8//4SJo9YAAOx6FEg==
  dependencies:
    "@stimulus/multimap" "^2.0.0"

"@stimulus/webpack-helpers@^2.0.0":
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/@stimulus/webpack-helpers/-/webpack-helpers-2.0.0.tgz#54296d2a2dffd4f962d2e802d99a3fdd84b8845f"
  integrity sha512-D6tJWsAC024MwGEIKlUVYU8Ln87mlrmiwHvYAjipg+s8H4eLxUMQ3PZkWyPevfipH+oR3leuHsjYsK1gN5ViQA==

application.js:

import { Application } from "stimulus"
import { definitionsFromContext } from "stimulus/webpack-helpers"

const application = Application.start()
const context = require.context("../controllers", true, /\.js$/)
application.load(definitionsFromContext(context))

html:

<div data-controller="loader"
     data-loader-url-value="/messages">
</div>

app/javascript/controllers/loader_controller.js:

import { Controller } from "stimulus";

export default class extends Controller {
  static values = { url: String };
  connect() {
    this.urlValue;
    debugger;
    fetch(this.urlValue).then(/* … */);
  }
}

And this.urlValue is undefined on the breakpoint. Am i missing something obvious here?