julienmonnerie/kirby/config/fields/range.php

<?php

return [
	'extends' => 'number',
	'props' => [
		/**
		 * Unset inherited props
		 */
		'placeholder' => null,

		/**
		 * The maximum value on the slider
		 */
		'max' => function (float $max = 100) {
			return $max;
		},
		/**
		 * Enables/disables the tooltip and set the before and after values
		 */
		'tooltip' => function ($tooltip = true) {
			return $tooltip;
		},
	]
];