diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index bbe5e3641..29ec2fc13 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -8,6 +8,7 @@ includes:
 
 parameters:
     level: 10
+    treatPhpDocTypesAsCertain: false
     paths:
         - samples/
         - src/
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index f379ff1fc..09c8c20d1 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -640,7 +640,7 @@ class Calculation extends CalculationLocale
         if ($this->formulaTokenCacheMaxSize > 0) {
             // Phpstan says if condition is always false,
             // but coverage report says next statement is covered.
-            if (count($this->formulaTokenCache) >= $this->formulaTokenCacheMaxSize) { // @phpstan-ignore-line
+            if (count($this->formulaTokenCache) >= $this->formulaTokenCacheMaxSize) {
                 $this->formulaTokenCache = [];
             }
             // Cache key is the original formula string (before ANCHORARRAY transformation)
@@ -1391,7 +1391,7 @@ class Calculation extends CalculationLocale
                 // do we now have a function/variable/number?
                 $expectingOperator = true;
                 $expectingOperand = false;
-                $val = $match[1] ?? ''; //* @phpstan-ignore-line
+                $val = $match[1] ?? '';
                 $length = strlen($val);
 
                 if (preg_match('/^' . self::CALCULATION_REGEXP_FUNCTION . '$/miu', $val, $matches)) {
diff --git a/src/PhpSpreadsheet/Calculation/Financial/CashFlow/Variable/NonPeriodic.php b/src/PhpSpreadsheet/Calculation/Financial/CashFlow/Variable/NonPeriodic.php
index 53668d134..130e4c103 100644
--- a/src/PhpSpreadsheet/Calculation/Financial/CashFlow/Variable/NonPeriodic.php
+++ b/src/PhpSpreadsheet/Calculation/Financial/CashFlow/Variable/NonPeriodic.php
@@ -166,7 +166,7 @@ class NonPeriodic
         $foundneg = false;
         for ($i = 0; $i < $valCount; ++$i) {
             $fld = $values[$i];
-            if (!is_numeric($fld)) { //* @phpstan-ignore-line
+            if (!is_numeric($fld)) {
                 return ExcelError::VALUE();
             } elseif ($fld > 0) {
                 $foundpos = true;
diff --git a/src/PhpSpreadsheet/Calculation/Information/Value.php b/src/PhpSpreadsheet/Calculation/Information/Value.php
index 4fee352c6..8280bc5ef 100644
--- a/src/PhpSpreadsheet/Calculation/Information/Value.php
+++ b/src/PhpSpreadsheet/Calculation/Information/Value.php
@@ -54,9 +54,7 @@ class Value
             }
 
             try {
-                // Phpstan claims cellValue can't be null.
-                // I don't see why.
-                [$column, $row] = Coordinate::indexesFromString($cellValue ?? ''); // @phpstan-ignore-line
+                [$column, $row] = Coordinate::indexesFromString($cellValue ?? '');
             } catch (SpreadsheetException) {
                 return false;
             }
diff --git a/src/PhpSpreadsheet/Calculation/LookupRef/Filter.php b/src/PhpSpreadsheet/Calculation/LookupRef/Filter.php
index 486194e46..3106d4e7e 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef/Filter.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef/Filter.php
@@ -58,7 +58,7 @@ class Filter
      */
     private static function filterByRow(array $lookupArray, array $matchArray): array
     {
-        $matchArray = array_values(array_column($matchArray, 0)); // @phpstan-ignore-line
+        $matchArray = array_values(array_column($matchArray, 0));
 
         return array_filter(
             array_values($lookupArray),
diff --git a/src/PhpSpreadsheet/Cell/Coordinate.php b/src/PhpSpreadsheet/Cell/Coordinate.php
index f7daa9d9b..038c4b065 100644
--- a/src/PhpSpreadsheet/Cell/Coordinate.php
+++ b/src/PhpSpreadsheet/Cell/Coordinate.php
@@ -745,7 +745,7 @@ abstract class Coordinate
                 }
             }
 
-            if ($rowStart !== null) { // @phpstan-ignore-line
+            if ($rowStart !== null) {
                 if ($rowStart == $rowEnd) {
                     $ranges[] = $hashedValue->col . $rowStart;
                 } else {
diff --git a/src/PhpSpreadsheet/IOFactory.php b/src/PhpSpreadsheet/IOFactory.php
index 7444aa879..7e4010f66 100644
--- a/src/PhpSpreadsheet/IOFactory.php
+++ b/src/PhpSpreadsheet/IOFactory.php
@@ -265,8 +265,7 @@ abstract class IOFactory
      */
     public static function registerWriter(string $writerType, string $writerClass): void
     {
-        // We want phpstan to validate caller, but still need this test
-        if (!is_a($writerClass, IWriter::class, true)) { //* @phpstan-ignore-line
+        if (!is_a($writerClass, IWriter::class, true)) {
             throw new Writer\Exception('Registered writers must implement ' . IWriter::class);
         }
 
@@ -280,8 +279,7 @@ abstract class IOFactory
      */
     public static function registerReader(string $readerType, string $readerClass): void
     {
-        // We want phpstan to validate caller, but still need this test
-        if (!is_a($readerClass, IReader::class, true)) { //* @phpstan-ignore-line
+        if (!is_a($readerClass, IReader::class, true)) {
             throw new Reader\Exception('Registered readers must implement ' . IReader::class);
         }
 
diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index b05ae877e..0c0199676 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -2403,7 +2403,7 @@ class Xlsx extends BaseReader
     {
         $returnValue = null;
         $protectKey = $protection[$key];
-        if (!empty($protectKey)) {
+        if (isset($protectKey)) {
             $protectKey = (string) $protectKey;
             $returnValue = $protectKey !== 'false' && (bool) $protectKey;
         }
diff --git a/src/PhpSpreadsheet/Settings.php b/src/PhpSpreadsheet/Settings.php
index 9c2beaa03..7759d9250 100644
--- a/src/PhpSpreadsheet/Settings.php
+++ b/src/PhpSpreadsheet/Settings.php
@@ -52,8 +52,7 @@ class Settings
      */
     public static function setChartRenderer(string $rendererClassName): void
     {
-        // We want phpstan to validate caller, but still need this test
-        if (!is_a($rendererClassName, IRenderer::class, true)) { //* @phpstan-ignore-line
+        if (!is_a($rendererClassName, IRenderer::class, true)) {
             throw new Exception('Chart renderer must implement ' . IRenderer::class);
         }
 
diff --git a/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/CellValue.php b/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/CellValue.php
index 435e6a60d..6d23b9d92 100644
--- a/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/CellValue.php
+++ b/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/CellValue.php
@@ -192,8 +192,7 @@ class CellValue extends WizardAbstract implements WizardInterface
         $retVal = true;
         $array = array_merge(array_keys(self::SINGLE_OPERATORS), array_keys(self::RANGE_OPERATORS));
         foreach ($array as $value) {
-            // PhpStan is correct about next statement, but we want to test anyhow
-            $retVal = $retVal && in_array($value, self::MAGIC_OPERATIONS, true); // @phpstan-ignore-line
+            $retVal = $retVal && in_array($value, self::MAGIC_OPERATIONS, true);
         }
 
         return $retVal;
diff --git a/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/TextValue.php b/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/TextValue.php
index 934a364ab..c1657666d 100644
--- a/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/TextValue.php
+++ b/src/PhpSpreadsheet/Style/ConditionalFormatting/Wizard/TextValue.php
@@ -169,8 +169,7 @@ class TextValue extends WizardAbstract implements WizardInterface
         $retVal = true;
         $array = array_keys(self::OPERATORS);
         foreach ($array as $value) {
-            // PhpStan is correct about next statement, but we want to test anyhow
-            $retVal = $retVal && in_array($value, self::MAGIC_OPERATIONS, true); // @phpstan-ignore-line
+            $retVal = $retVal && in_array($value, self::MAGIC_OPERATIONS, true);
         }
 
         return $retVal;
diff --git a/src/PhpSpreadsheet/Worksheet/AutoFilter.php b/src/PhpSpreadsheet/Worksheet/AutoFilter.php
index 04070e5d9..05afcfb24 100644
--- a/src/PhpSpreadsheet/Worksheet/AutoFilter.php
+++ b/src/PhpSpreadsheet/Worksheet/AutoFilter.php
@@ -752,14 +752,11 @@ class AutoFilter implements Stringable
     private function dynamicFilterDateRange(string $dynamicRuleType, AutoFilter\Column &$filterColumn): array
     {
         $ruleValues = [];
-        $callBack = [__CLASS__, self::DATE_FUNCTIONS[$dynamicRuleType]]; // What if not found?
+        $callBack = [__CLASS__, self::DATE_FUNCTIONS[$dynamicRuleType] ?? throw new Exception("invalid dynamic rule type $dynamicRuleType")];
         //    Calculate start/end dates for the required date range based on current date
         //    Val is lowest permitted value.
         //    Maxval is greater than highest permitted value
-        $val = $maxval = 0;
-        if (is_callable($callBack)) { //* @phpstan-ignore-line
-            [$val, $maxval] = $callBack();
-        }
+        [$val, $maxval] = $callBack();
         $val = Date::dateTimeToExcel($val);
         $maxval = Date::dateTimeToExcel($maxval);
 
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index f6a2c4ba1..d3e9e4dd3 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -1687,8 +1687,7 @@ class Worksheet
     public function duplicateConditionalStyle(array $styles, string $range = ''): static
     {
         foreach ($styles as $cellStyle) {
-            // Php runtime doesn't support docblock declaration
-            if (!($cellStyle instanceof Conditional)) { // @phpstan-ignore-line
+            if (!($cellStyle instanceof Conditional)) {
                 throw new Exception('Style is not a conditional style');
             }
         }