private function getIgnoredFunctions(): array
    {
        if ($this->ignoredFunctions === null) {
            $ignoredFunctions = require __DIR__.'/../config/ignoredFunctions.php';
            $specialCaseFunctions = require __DIR__.'/../config/specialCasesFunctions.php';

            $this->ignoredFunctions = array_merge($ignoredFunctions, $specialCaseFunctions);
        }
        return $this->ignoredFunctions;
    }