datetime-duration-challenge/app/DTO/DurationResult.php

<?php

namespace App\DTO;

use Spatie\LaravelData\Data;

class DurationResult extends Data
{
    /**
     * @param int $days
     * @param int $weekDays
     * @param int $weeks
     * @return void
     */
    public function __construct(
        public int|float $days,
        public int|float $weekDays,
        public int|float $weeks,
    ) {
        $this->days = $this->formatFloat($days);
        $this->weekDays = $this->formatFloat($weekDays);
        $this->weeks = $this->formatFloat($weeks);
    }

    private function formatFloat(int|float $val): int|float
    {
        if (!is_float($val)) {
            return $val;
        }

        return (float) number_format($val, 5, '.', '');
    }
}