julienmonnerie/kirby/config/fields/mixins/min.php

<?php

return [
	'computed' => [
		'min' => function () {
			// set min to at least 1, if required
			if ($this->required === true) {
				return $this->min ?? 1;
			}

			return $this->min;
		},
		'required' => function () {
			// set required to true if min is set
			if ($this->min) {
				return true;
			}

			return $this->required;
		}
	]
];