Cf. https://web.dev/more-capable-form-controls/ , https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/formdata_event We should fire it [here](https://github.com/hyperform/hyperform/blob/ec790c62ca7cb517da638e6d02a0477e3f98c010/src/tools/catch_submit.js#L32) to be on par with native submits.
Cf. https://web.dev/more-capable-form-controls/ , https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/formdata_event
We should fire it here to be on par with native submits.