Set formula attributes datatype in Cell

Author: MarkBaker

phpstan-baseline.neon

@@ -1,3 +1,6 @@
+			count: 2
+			path: src/PhpSpreadsheet/Calculation/Calculation.php
+
 parameters:
 	ignoreErrors:
 		-
@@ -7,9 +10,6 @@ parameters:
 
 		-
 			message: "#^Argument of an invalid type mixed supplied for foreach, only iterables are supported\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
 		-
 			message: "#^Cannot access offset 'onlyIf' on mixed\\.$#"
 			count: 3

src/PhpSpreadsheet/Cell/Cell.php

@@ -65,6 +65,8 @@ class Cell
 
     /**
      * Attributes of the formula.
+     *
+     * @var null|array
      */
     private $formulaAttributes;
 
@@ -701,11 +703,11 @@ public function setXfIndex($indexValue)
     /**
      * Set the formula attributes.
      *
-     * @param mixed $attributes
+     * @param mixed[] $attributes
      *
      * @return $this
      */
-    public function setFormulaAttributes($attributes)
+    public function setFormulaAttributes(array $attributes)
     {
         $this->formulaAttributes = $attributes;
 
@@ -715,7 +717,7 @@ public function setFormulaAttributes($attributes)
     /**
      * Get the formula attributes.
      */
-    public function getFormulaAttributes()
+    public function getFormulaAttributes(): ?array
     {
         return $this->formulaAttributes;
     }