Cache annotations

Author: markrandall

src/Metadata/VersionData.php

@@ -13,8 +13,11 @@
 
 final class VersionData
 {
-    private static $_cache = [];
-    private static $_all = null;
+    /** @var array<string, VersionData>  */
+    private static array $_cache = [];
+
+    /** @var array<string, VersionData>|null  */
+    private static array|null $_all = null;
 
     public readonly int $majorVersion;
     public readonly int $minorVersion;