diff --git a/src/Compile/Base.php b/src/Compile/Base.php
index b8d6c9b2c..33e8732e6 100644
--- a/src/Compile/Base.php
+++ b/src/Compile/Base.php
@@ -72,11 +72,11 @@ protected function formatParamsArray(array $_attr): array {
 	/**
 	 * Returns attribute index for unnamed ("shorthand") attribute, or null if not allowed.
 	 *
-	 * @param int $key
+	 * @param string|int|null $key Index of the argument. Type should probably be narrowed to int
 	 *
 	 * @return string|int|null
 	 */
-	protected function getShorthandOrder(int $key) {
+	protected function getShorthandOrder(mixed $key) {
 	    return $this->shorttag_order[$key] ?? null;
 	}
 
diff --git a/src/Compile/Tag/BCPluginWrapper.php b/src/Compile/Tag/BCPluginWrapper.php
index dfb174644..09e985350 100644
--- a/src/Compile/Tag/BCPluginWrapper.php
+++ b/src/Compile/Tag/BCPluginWrapper.php
@@ -27,11 +27,11 @@ public function __construct($callback, bool $cacheable = true) {
          * For compiler plugins, we allow arbitrarily many unnamed attributes,
          * and just make them accessible in the order they are set.
          *
-         * @param int $key
+	 * @param string|int|null $key Index of the argument. Type should probably be narrowed to int
          *
-         * @return int
+         * @return string|int|null
          */
-        protected function getShorthandOrder(int $key): int {
+        protected function getShorthandOrder(mixed $key) {
             return $key;
         }