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Editing:Mutability.php

<?php

declare(strict_types=1);

/**
 * This file is part of the Carbon package.
 *
 * (c) Brian Nesbitt <brian@nesbot.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Carbon\Traits;

use Carbon\Carbon;
use Carbon\CarbonImmutable;

/**
 * Trait Mutability.
 *
 * Utils to know if the current object is mutable or immutable and convert it.
 */
trait Mutability
{
    use Cast;

/**
     * Returns true if the current class/instance is mutable.
     */
    public static function isMutable(): bool
    {
        return false;
    }

/**
     * Returns true if the current class/instance is immutable.
     */
    public static function isImmutable(): bool
    {
        return !static::isMutable();
    }

/**
     * Return a mutable copy of the instance.
     */
    public function toMutable(): Carbon
    {
        return $this->cast(Carbon::class);
    }

/**
     * Return an immutable copy of the instance.
     */
    public function toImmutable(): CarbonImmutable
    {
        // Immutable objects are fine as is (uncloned)
        if ($this::class === CarbonImmutable::class) {
            return $this;
        }

return $this->cast(CarbonImmutable::class);
    }
}

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