MultipleAttribute.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Attribute;

class MultipleAttribute extends \TYPO3\CMS\Form\Domain\Model\Attribute\AbstractAttribute {

    public function getValue() {
        if (((int)$this->value === 1 || (bool)$this->value === TRUE) || strtolower((string)$this->value) === 'multiple') {
            $attribute = 'multiple';
        }
        return $attribute;
    }

}