TYPO3 Core

Reported by Rafael Kähm in https://forge.typo3.org/issues/99503#note-13

Please reopen, because applied patch makes unnecessary BC at least on 11.5.
See:

    public function cObjGet($setup, $addKey = '')
    {
        return implode('', $this->cObjGetSeparated($setup, $addKey));
    }

    public function cObjGetSeparated(?array $setup, string $addKey = ''): array
    {
        if (!is_array($setup) || $setup === []) {
            return [];
        }

Proposal:

    public function cObjGet($setup, $addKey = '')
    {
        if (!is_array($setup)) {
            return '';
        }
        return implode('', $this->cObjGetSeparated($setup, $addKey));
    }

    public function cObjGetSeparated(?array $setup = [], string $addKey = ''): array
    {
        if (empty($setup)) {
            return [];
        }
    }