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How to add a boolen attribute to a form?

I am trying to add the boolean attribute "novalidate" to all my forms.

I have tried numerous approaches in my theme_preprocess_form function but no luck. I see in some preprocess functions, $variables[‘attribute’] is an object and has methods like addClass() and setAttribute(). But in _preprocess_form it is an array. Plus setAttribute doesnt sound like it will do boolean attributes anyway.

I tried to simply override the twig template for a form and do this:

<form{{ attributes }} novalidate>   {{ children }} </form>

but even that outputs:

<form novalidate="">
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How to add a boolen attribute to a form?

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