Fix: Describe iterable type

Author: localheinz

src/Data/ProcessedCodeCoverageData.php

@@ -42,14 +42,15 @@
  *      hit: list<TestIdType>
  *  }
  * @phpstan-type FunctionCoverageType array<string, array<string, FunctionCoverageDataType>>
+ * @phpstan-type LineCoverageType array<string, array<int, null|list<TestIdType>>>
  */
 final class ProcessedCodeCoverageData
 {
     /**
      * Line coverage data.
      * An array of filenames, each having an array of linenumbers, each executable line having an array of testcase ids.
      *
-     * @var array<string, array<int, null|list<TestIdType>>>
+     * @var LineCoverageType
      */
     private array $lineCoverage = [];
 
@@ -112,11 +113,17 @@ public function markCodeAsExecutedByTestCase(string $testCaseId, RawCodeCoverage
         }
     }
 
+    /**
+     * @param LineCoverageType $lineCoverage
+     */
     public function setLineCoverage(array $lineCoverage): void
     {
         $this->lineCoverage = $lineCoverage;
     }
 
+    /**
+     * @return LineCoverageType
+     */
     public function lineCoverage(): array
     {
         ksort($this->lineCoverage);