When setting up a sign-up form, there are custom field options. Using the required checkbox is not working with a custom checkbox.
Expected behaviour:
When using a custom field with the "checkbox" option and the "required" option is set, the form should not be accepted if the checkbox is not ticked and a warning should be shown to the user.
Actual behaviour:
The form got submitted and the double-opt-in-e-mail got send.
When accessing the new contact in the contacts area, it shows in the json under Data like that:
"custom-field": false

I tested the same field with just "text" and it worked correctly, the form was not accepted and a warning was shown.

€dited because of some obvious spelling errors.