Add basic support for Error functions when the error is #SPILL! or #CALC!

src/PhpSpreadsheet/Calculation/Information/ErrorValue.php

@@ -47,7 +47,7 @@ class ErrorValue
             return false;
         }
 
-        return in_array($value, ExcelError::$errorCodes);
+        return in_array($value, ExcelError::$errorCodes) || $value === ExcelError::CALC();
     }
 
     /**

src/PhpSpreadsheet/Calculation/Information/ExcelError.php

@@ -22,6 +22,7 @@ class ExcelError
         'num' => '#NUM!',
         'na' => '#N/A',
         'gettingdata' => '#GETTING_DATA',
+        'spill' => '#SPILL!',
     ];
 
     /**
@@ -45,6 +46,10 @@ class ExcelError
             ++$i;
         }
 
+        if ($value === self::CALC()) {
+            return 14;
+        }
+
         return self::NA();
     }
 

tests/data/Calculation/Information/ERROR_TYPE.php

@@ -53,4 +53,12 @@ return [
         7,
         '#N/A',
     ],
+    [
+        9,
+        '#SPILL!',
+    ],
+    [
+        14,
+        '#CALC!',
+    ],
 ];

tests/data/Calculation/Information/IS_ERROR.php

@@ -49,6 +49,14 @@ return [
         true,
         '#N/A',
     ],
+    [
+        true,
+        '#SPILL!',
+    ],
+    [
+        true,
+        '#CALC!',
+    ],
     [
         false,
         'TRUE',