Fix hexadecimal decoding (fixes #715) #648

Job	Run time
PHPUnit (PHP 7.2)	40s
Tests alternative autoloader (PHP 7.1)	7s
PHPUnit Composer v2 (PHP 7.4)	26s
PHPUnit (PHP 7.3)	29s
Tests alternative autoloader (PHP 7.2)	6s
PHPUnit coverage (PHP 7.4)	1m 9s
PHPUnit (PHP 7.4)	35s
Tests alternative autoloader (PHP 7.3)	9s
PHPUnit (PHP 8.0)	34s
PHPUnit (PHP 7.1)	40s
Tests alternative autoloader (PHP 7.4)	5s
PHPUnit lowest deps (PHP 7.3)	35s
PHPUnit (PHP 8.1)	36s
Tests alternative autoloader (PHP 8.0)	10s
PHPUnit (PHP 8.2)	37s
Tests alternative autoloader (PHP 8.1)	5s
Windows-Tests with PHP 7.1	56s
PHPUnit (PHP 8.3)	36s
Tests alternative autoloader (PHP 8.2)	10s
Windows-Tests with PHP 7.2	53s
Tests alternative autoloader (PHP 8.3)	10s
Windows-Tests with PHP 7.3	51s
Windows-Tests with PHP 7.4	49s
Windows-Tests with PHP 8.0	44s
Windows-Tests with PHP 8.1	51s
Windows-Tests with PHP 8.2	48s
Windows-Tests with PHP 8.3	50s
	14m 41s

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