Fix hexadecimal decoding (fixes #715) #651

Job	Run time
PHPUnit (PHP 7.2)	39s
Tests alternative autoloader (PHP 7.1)	6s
PHPUnit (PHP 7.3)	28s
Tests alternative autoloader (PHP 7.2)	11s
PHPUnit Composer v2 (PHP 7.4)	41s
PHPUnit (PHP 7.4)	28s
Tests alternative autoloader (PHP 7.3)	19s
PHPUnit coverage (PHP 7.4)	1m 8s
PHPUnit (PHP 8.0)	42s
Tests alternative autoloader (PHP 7.4)	5s
PHPUnit (PHP 7.1)	42s
PHPUnit (PHP 8.1)	27s
Tests alternative autoloader (PHP 8.0)	6s
PHPUnit (PHP 8.2)	30s
PHPUnit lowest deps (PHP 7.3)	35s
Tests alternative autoloader (PHP 8.1)	7s
Tests alternative autoloader (PHP 8.2)	9s
PHPUnit (PHP 8.3)	34s
Windows-Tests with PHP 7.1	1m 12s
Tests alternative autoloader (PHP 8.3)	11s
Windows-Tests with PHP 7.2	55s
Windows-Tests with PHP 7.3	55s
Windows-Tests with PHP 7.4	56s
Windows-Tests with PHP 8.0	1m 23s
Windows-Tests with PHP 8.1	56s
Windows-Tests with PHP 8.2	55s
Windows-Tests with PHP 8.3	51s
	16m 11s

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