readonly properties #1259

Job	Run time
Linter / json-linter	30s
PHP-Linter (8.4) / linter	13s
Linter / yaml-linter	7s
PHP-Linter (8.5) / linter	13s
PHP-Linter (8.2) / linter	18s
PHP-Linter (8.3) / linter	11s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Security checks	0s
Quality control	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Code coverage	-1s
Cleanup artifacts	-1s
	1m 30s

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