Forms/Input does not work properly, doesn't attach attributes

[doxigo]

Describe the bug
Looking at the _input.twig file and the forms.wingsuit.yml file, there seems to be some errors, the online demo also has the issue as well

the attributes section doesn't really get filled with placeholder, type and possibly value correctly.

If you inspect the checkbox or submit, for instance, you don't see the "type" there

We can fix this by using .setAttribute('type', variant) and using fields for placeholder and value like so:

{% set attributes = attributes.addClass(classes)
.setAttribute('type', variant)
.setAttribute('placeholder', placeholder)
.setAttribute('value', default_input)
 %}

but I wonder if there's a better way to tackle this? ie. using settings as intended

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Forms/Inputs/Checkbox'

Expected behavior
Proper support of placeholder, type and possibly value

Also a side note I wonder if there's an easy way to access the settings values in twig? couldn't find any documentations on that