Fix: Describe iterable type

src/Data/ProcessedCodeCoverageData.php

@@ -149,6 +149,9 @@
         return $this->functionCoverage;
     }
 
+    /**
+     * @return list<non-empty-string>
+     */
     public function coveredFiles(): array
     {
         ksort($this->lineCoverage);
@@ -235,7 +238,7 @@
      *
      * @return 1|2|3|4
      */
     private function priorityForLine(array $data, int $line): int
     {
         if (!array_key_exists($line, $data)) {
             return 1;