Revert "Simplify"

This reverts commit dada762.

Author: sebastianbergmann

src/TextUI/TestRunner.php

@@ -546,7 +546,7 @@ public function run(Test $suite, array $arguments = [], bool $exit = true): Test
                 );
             }
 
-            if ($arguments['disableCodeCoverageIgnore']) {
+            if (isset($arguments['disableCodeCoverageIgnore']) && $arguments['disableCodeCoverageIgnore'] === true) {
                 $codeCoverage->setDisableIgnoredLines(true);
             }