diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index d941767e..3e33cac1 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -80,6 +80,7 @@ jobs:
         with:
           php-version: 8.3
           coverage: none
+          extensions: ds
           ini-values: opcache.enable_cli=1, opcache.jit=1255
 
       - name: Build local Phar file
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4dd7a50f..cd88349b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -56,7 +56,7 @@ jobs:
         with:
           php-version: 8.3
           coverage: xdebug
-          extensions: ast
+          extensions: ast, ds
 
       - name: Build project
         run: make build --no-print-directory
@@ -100,7 +100,7 @@ jobs:
         with:
           php-version: 8.1
           coverage: none
-          extensions: ast
+          extensions: ast, ds
 
       - name: Install project
         run: make build --no-print-directory
@@ -142,7 +142,7 @@ jobs:
         with:
           php-version: highest
           coverage: none
-          extensions: ast
+          extensions: ast, ds
 
       - name: Install project
         run: make build --no-print-directory
@@ -182,6 +182,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: 8.3
+          extensions: ds
 
       - name: Build project in production mode
         run: make build-prod --no-print-directory
@@ -214,6 +215,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
+          extensions: ds
 
       - name: Build project in production mode
         run: make build-prod build-phar-file --no-print-directory
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 8e2f0ba9..a61c2649 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -32,6 +32,7 @@ jobs:
         with:
           php-version: 8.3
           tools: composer
+          extensions: ds
 
       - name: Build project in production mode
         run: make build-prod build-phar-file --no-print-directory
diff --git a/Dockerfile b/Dockerfile
index e5cd65d4..f29a585b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ FROM php:8.3-cli-alpine
 
 # Install PHP extensions
 ADD --chmod=0755 https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
-RUN install-php-extensions opcache @composer
+RUN install-php-extensions opcache ds @composer
 
 # Install application
 # run `make build-version` before!
diff --git a/composer.json b/composer.json
index 39305c66..94f5f466 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name"              : "jbzoo/csv-blueprint",
-    "type" : "project",
+    "type"              : "project",
     "description"       : "CLI Utility for Validating and Generating CSV Files Based on Custom Rules. It ensures your data meets specified criteria, streamlining data management and integrity checks.",
     "license"           : "MIT",
     "keywords"          : [
@@ -29,6 +29,7 @@
     "require"           : {
         "php"                                 : "^8.1",
         "ext-mbstring"                        : "*",
+        "ext-ds" : "*",
 
         "league/csv"                          : "^9.15.0",
         "jbzoo/data"                          : "^7.1.1",
diff --git a/src/Rules/AbstarctRule.php b/src/Rules/AbstarctRule.php
index ae373cc8..1c60a3d2 100644
--- a/src/Rules/AbstarctRule.php
+++ b/src/Rules/AbstarctRule.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Utils;
 use JBZoo\CsvBlueprint\Validators\Error;
 use JBZoo\CsvBlueprint\Validators\ValidatorColumn;
@@ -61,7 +62,7 @@ public function __construct(
         // TODO: Move resolving and validating expected value on this stage to make it only once (before validation).
     }
 
-    public function validate(array|string $cellValue, int $line = ValidatorColumn::FALLBACK_LINE): ?Error
+    public function validate(array|string|Vector $cellValue, int $line = ValidatorColumn::FALLBACK_LINE): ?Error
     {
         // TODO: Extract to abstract boolean cell/agregate rule
         if ($this->isEnabled($cellValue) === false) {
@@ -185,7 +186,7 @@ protected function getOptionAsArray(): array
      * Optimize performance
      * There is no need to validate empty values for predicates or if it's disabled.
      */
-    protected function isEnabled(array|string $cellValue): bool
+    protected function isEnabled(string|Vector $cellValue): bool
     {
         // List of rules that should be checked for empty values
         $exclusions = [
diff --git a/src/Rules/AbstarctRuleCombo.php b/src/Rules/AbstarctRuleCombo.php
index 80689781..1831126a 100644
--- a/src/Rules/AbstarctRuleCombo.php
+++ b/src/Rules/AbstarctRuleCombo.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\Aggregate\AbstractAggregateRuleCombo;
 use JBZoo\CsvBlueprint\Rules\Cell\AbstractCellRuleCombo;
 use JBZoo\CsvBlueprint\Validators\Error;
@@ -38,7 +39,7 @@ abstract protected function getExpected(): float;
 
     abstract protected function getActual(array|string $value): float;
 
-    public function validate(array|string $cellValue, int $line = ValidatorColumn::FALLBACK_LINE): ?Error
+    public function validate(string|Vector $cellValue, int $line = ValidatorColumn::FALLBACK_LINE): ?Error
     {
         $error = $this->validateCombo($cellValue);
 
@@ -51,7 +52,7 @@ public function validate(array|string $cellValue, int $line = ValidatorColumn::F
 
     public function test(array|string $cellValue, bool $isHtml = false): string
     {
-        $errorMessage = (string)$this->validateCombo($cellValue);
+        $errorMessage = (string)$this->validateCombo(new Vector($cellValue));
 
         return $isHtml ? $errorMessage : \strip_tags($errorMessage);
     }
@@ -96,7 +97,7 @@ protected static function compare(float $expected, float $actual, string $mode):
         };
     }
 
-    private function validateCombo(array|string $cellValue): ?string
+    private function validateCombo(string|Vector $cellValue): ?string
     {
         if ($this instanceof AbstractCellRuleCombo) {
             if (!\is_string($cellValue)) {
@@ -107,7 +108,7 @@ private function validateCombo(array|string $cellValue): ?string
         }
 
         if ($this instanceof AbstractAggregateRuleCombo) {
-            if (!\is_array($cellValue)) {
+            if (!$cellValue instanceof Vector) {
                 throw new \InvalidArgumentException('The value should be an array of numbers/strings');
             }
 
diff --git a/src/Rules/Aggregate/AbstractAggregateRule.php b/src/Rules/Aggregate/AbstractAggregateRule.php
index 5c8a4165..d6915b10 100644
--- a/src/Rules/Aggregate/AbstractAggregateRule.php
+++ b/src/Rules/Aggregate/AbstractAggregateRule.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 abstract class AbstractAggregateRule extends AbstarctRule
@@ -28,10 +29,8 @@ abstract class AbstractAggregateRule extends AbstarctRule
      * TODO: This method takes an array reference &$columnValues as input and returns a nullable string.
      * We use a reference to the array to avoid copying the array. Important memory optimization!
      * Please DO NOT change the array in this method!
-     *
-     * @param string[] $columnValues
      */
-    abstract public function validateRule(array $columnValues): ?string;
+    abstract public function validateRule(Vector $columnValues): ?string;
 
     public function test(array $cellValue, bool $isHtml = false): string
     {
diff --git a/src/Rules/Aggregate/AbstractAggregateRuleCombo.php b/src/Rules/Aggregate/AbstractAggregateRuleCombo.php
index f678cba4..f7c19348 100644
--- a/src/Rules/Aggregate/AbstractAggregateRuleCombo.php
+++ b/src/Rules/Aggregate/AbstractAggregateRuleCombo.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use JBZoo\CsvBlueprint\Rules\AbstarctRuleCombo;
 
@@ -23,7 +24,7 @@ abstract class AbstractAggregateRuleCombo extends AbstarctRuleCombo
 {
     public const INPUT_TYPE = AbstarctRule::INPUT_TYPE_STRINGS;
 
-    abstract protected function getActualAggregate(array $colValues): ?float;
+    abstract protected function getActualAggregate(Vector $colValues): ?float;
 
     public function getRuleCode(?string $mode = null): string
     {
@@ -46,7 +47,7 @@ protected function getExpected(): float
         return $this->getOptionAsFloat();
     }
 
-    protected function validateComboAggregate(array $colValues, string $mode): ?string
+    protected function validateComboAggregate(Vector $colValues, string $mode): ?string
     {
         $prefix = $mode === self::NOT ? 'not ' : '';
         $verb = static::VERBS[$mode];
@@ -54,13 +55,13 @@ protected function validateComboAggregate(array $colValues, string $mode): ?stri
 
         try {
             // TODO: Think about the performance optimization here
-            if (static::INPUT_TYPE === AbstarctRule::INPUT_TYPE_FLOATS) {
-                $colValues = \array_map('floatval', $colValues);
-            }
-
-            if (static::INPUT_TYPE === AbstarctRule::INPUT_TYPE_INTS) {
-                $colValues = \array_map('intval', $colValues);
-            }
+            // if (static::INPUT_TYPE === AbstarctRule::INPUT_TYPE_FLOATS) {
+            //     $colValues = \array_map('floatval', $colValues);
+            // }
+            //
+            // if (static::INPUT_TYPE === AbstarctRule::INPUT_TYPE_INTS) {
+            //     $colValues = \array_map('intval', $colValues);
+            // }
 
             $actual = $this->getActualAggregate($colValues); // Important to use the original method here!
         } catch (\Throwable $exception) {
diff --git a/src/Rules/Aggregate/ComboAverage.php b/src/Rules/Aggregate/ComboAverage.php
index 520385a1..b6f089ae 100644
--- a/src/Rules/Aggregate/ComboAverage.php
+++ b/src/Rules/Aggregate/ComboAverage.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -30,12 +31,12 @@ public function getHelpMeta(): array
         return [['Regular the arithmetic mean. The sum of the numbers divided by the count.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
         }
 
-        return Average::mean($colValues);
+        return Average::mean($colValues->toArray());
     }
 }
diff --git a/src/Rules/Aggregate/ComboCoefOfVar.php b/src/Rules/Aggregate/ComboCoefOfVar.php
index 5b593030..c52e0977 100644
--- a/src/Rules/Aggregate/ComboCoefOfVar.php
+++ b/src/Rules/Aggregate/ComboCoefOfVar.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboContraharmonicMean.php b/src/Rules/Aggregate/ComboContraharmonicMean.php
index dc63a32e..ecebecd7 100644
--- a/src/Rules/Aggregate/ComboContraharmonicMean.php
+++ b/src/Rules/Aggregate/ComboContraharmonicMean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -37,7 +38,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCount.php b/src/Rules/Aggregate/ComboCount.php
index 7a8735ec..5370d68b 100644
--- a/src/Rules/Aggregate/ComboCount.php
+++ b/src/Rules/Aggregate/ComboCount.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCount extends AbstractAggregateRuleCombo
@@ -36,7 +37,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         return \count($colValues);
     }
diff --git a/src/Rules/Aggregate/ComboCountDistinct.php b/src/Rules/Aggregate/ComboCountDistinct.php
index 2af8d93f..2f64846a 100644
--- a/src/Rules/Aggregate/ComboCountDistinct.php
+++ b/src/Rules/Aggregate/ComboCountDistinct.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountDistinct extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Number of unique values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountEmpty.php b/src/Rules/Aggregate/ComboCountEmpty.php
index 32425180..b761a3d9 100644
--- a/src/Rules/Aggregate/ComboCountEmpty.php
+++ b/src/Rules/Aggregate/ComboCountEmpty.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountEmpty extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Counts only empty values (string length is 0).'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountEven.php b/src/Rules/Aggregate/ComboCountEven.php
index c7c8d59e..76b6059c 100644
--- a/src/Rules/Aggregate/ComboCountEven.php
+++ b/src/Rules/Aggregate/ComboCountEven.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountEven extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Number of even values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountNegative.php b/src/Rules/Aggregate/ComboCountNegative.php
index 74e9336f..c2c0c27d 100644
--- a/src/Rules/Aggregate/ComboCountNegative.php
+++ b/src/Rules/Aggregate/ComboCountNegative.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountNegative extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Number of negative values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountNotEmpty.php b/src/Rules/Aggregate/ComboCountNotEmpty.php
index 7fbf20f4..17104b68 100644
--- a/src/Rules/Aggregate/ComboCountNotEmpty.php
+++ b/src/Rules/Aggregate/ComboCountNotEmpty.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountNotEmpty extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Counts only not empty values (string length is not 0).'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountOdd.php b/src/Rules/Aggregate/ComboCountOdd.php
index 9fad05c2..25a598a6 100644
--- a/src/Rules/Aggregate/ComboCountOdd.php
+++ b/src/Rules/Aggregate/ComboCountOdd.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountOdd extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Number of odd values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountPositive.php b/src/Rules/Aggregate/ComboCountPositive.php
index ad428a2e..638b96d4 100644
--- a/src/Rules/Aggregate/ComboCountPositive.php
+++ b/src/Rules/Aggregate/ComboCountPositive.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountPositive extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Number of positive values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountPrime.php b/src/Rules/Aggregate/ComboCountPrime.php
index 80aa303d..483a59f9 100644
--- a/src/Rules/Aggregate/ComboCountPrime.php
+++ b/src/Rules/Aggregate/ComboCountPrime.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use Respect\Validation\Validator;
 
@@ -30,7 +31,7 @@ public function getHelpMeta(): array
         return [['Number of prime values.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCountZero.php b/src/Rules/Aggregate/ComboCountZero.php
index 71a192ba..2f05c0c7 100644
--- a/src/Rules/Aggregate/ComboCountZero.php
+++ b/src/Rules/Aggregate/ComboCountZero.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboCountZero extends AbstractAggregateRuleCombo
@@ -35,7 +36,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboCubicMean.php b/src/Rules/Aggregate/ComboCubicMean.php
index ff12de85..4e136881 100644
--- a/src/Rules/Aggregate/ComboCubicMean.php
+++ b/src/Rules/Aggregate/ComboCubicMean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -30,7 +31,7 @@ public function getHelpMeta(): array
         return [['Cubic mean. See: https://en.wikipedia.org/wiki/Cubic_mean'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboFirstNum.php b/src/Rules/Aggregate/ComboFirstNum.php
index 7ebe852d..e6847306 100644
--- a/src/Rules/Aggregate/ComboFirstNum.php
+++ b/src/Rules/Aggregate/ComboFirstNum.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboFirstNum extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['First number in the column. Expected value is float or integer.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (!isset($colValues[0])) {
             return null;
diff --git a/src/Rules/Aggregate/ComboGeometricMean.php b/src/Rules/Aggregate/ComboGeometricMean.php
index c2e94e61..abfcd266 100644
--- a/src/Rules/Aggregate/ComboGeometricMean.php
+++ b/src/Rules/Aggregate/ComboGeometricMean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboHarmonicMean.php b/src/Rules/Aggregate/ComboHarmonicMean.php
index 5db8bd49..4c5d4ca7 100644
--- a/src/Rules/Aggregate/ComboHarmonicMean.php
+++ b/src/Rules/Aggregate/ComboHarmonicMean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboInterquartileMean.php b/src/Rules/Aggregate/ComboInterquartileMean.php
index 2fda3558..89b66fc6 100644
--- a/src/Rules/Aggregate/ComboInterquartileMean.php
+++ b/src/Rules/Aggregate/ComboInterquartileMean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -40,7 +41,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboLastNum.php b/src/Rules/Aggregate/ComboLastNum.php
index f32b90b0..fd59b814 100644
--- a/src/Rules/Aggregate/ComboLastNum.php
+++ b/src/Rules/Aggregate/ComboLastNum.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboLastNum extends AbstractAggregateRuleCombo
@@ -29,7 +30,7 @@ public function getHelpMeta(): array
         return [['Last number in the column. Expected value is float or integer.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboMeanAbsDev.php b/src/Rules/Aggregate/ComboMeanAbsDev.php
index 41a9533d..0cab8137 100644
--- a/src/Rules/Aggregate/ComboMeanAbsDev.php
+++ b/src/Rules/Aggregate/ComboMeanAbsDev.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -37,7 +38,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboMedian.php b/src/Rules/Aggregate/ComboMedian.php
index b766f990..29ba4bee 100644
--- a/src/Rules/Aggregate/ComboMedian.php
+++ b/src/Rules/Aggregate/ComboMedian.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -36,7 +37,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboMedianAbsDev.php b/src/Rules/Aggregate/ComboMedianAbsDev.php
index c87c7021..d06e4cad 100644
--- a/src/Rules/Aggregate/ComboMedianAbsDev.php
+++ b/src/Rules/Aggregate/ComboMedianAbsDev.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboMidhinge.php b/src/Rules/Aggregate/ComboMidhinge.php
index 63411186..67386b1b 100644
--- a/src/Rules/Aggregate/ComboMidhinge.php
+++ b/src/Rules/Aggregate/ComboMidhinge.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboNthNum.php b/src/Rules/Aggregate/ComboNthNum.php
index 9861037a..99820335 100644
--- a/src/Rules/Aggregate/ComboNthNum.php
+++ b/src/Rules/Aggregate/ComboNthNum.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 use function JBZoo\Utils\float;
@@ -56,7 +57,7 @@ protected function getExpected(): float
         return float($this->getParams()[self::VAL]);
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboPercentile.php b/src/Rules/Aggregate/ComboPercentile.php
index 3bec50e3..04682069 100644
--- a/src/Rules/Aggregate/ComboPercentile.php
+++ b/src/Rules/Aggregate/ComboPercentile.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -59,7 +60,7 @@ protected function getExpected(): float
         return float($this->getParams()[self::VAL]);
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboPopulationVariance.php b/src/Rules/Aggregate/ComboPopulationVariance.php
index f33b195e..98a506f5 100644
--- a/src/Rules/Aggregate/ComboPopulationVariance.php
+++ b/src/Rules/Aggregate/ComboPopulationVariance.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -37,7 +38,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboQuartiles.php b/src/Rules/Aggregate/ComboQuartiles.php
index ed52ad8c..9de16cba 100644
--- a/src/Rules/Aggregate/ComboQuartiles.php
+++ b/src/Rules/Aggregate/ComboQuartiles.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use JBZoo\CsvBlueprint\Utils;
 use MathPHP\Statistics\Descriptive;
@@ -67,7 +68,7 @@ protected function getExpected(): float
         return float($this->getParams()[self::VAL]);
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboRootMeanSquare.php b/src/Rules/Aggregate/ComboRootMeanSquare.php
index da682cb6..a6ff26d1 100644
--- a/src/Rules/Aggregate/ComboRootMeanSquare.php
+++ b/src/Rules/Aggregate/ComboRootMeanSquare.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -37,7 +38,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboSampleVariance.php b/src/Rules/Aggregate/ComboSampleVariance.php
index bd785d07..ffbae5b0 100644
--- a/src/Rules/Aggregate/ComboSampleVariance.php
+++ b/src/Rules/Aggregate/ComboSampleVariance.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -37,7 +38,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboStddev.php b/src/Rules/Aggregate/ComboStddev.php
index 08b1ea17..e77ba32d 100644
--- a/src/Rules/Aggregate/ComboStddev.php
+++ b/src/Rules/Aggregate/ComboStddev.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -42,7 +43,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboStddevPop.php b/src/Rules/Aggregate/ComboStddevPop.php
index cdf9f67b..387b943e 100644
--- a/src/Rules/Aggregate/ComboStddevPop.php
+++ b/src/Rules/Aggregate/ComboStddevPop.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Descriptive;
 
@@ -35,7 +36,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/ComboSum.php b/src/Rules/Aggregate/ComboSum.php
index 6b85d513..44d44168 100644
--- a/src/Rules/Aggregate/ComboSum.php
+++ b/src/Rules/Aggregate/ComboSum.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class ComboSum extends AbstractAggregateRuleCombo
@@ -29,8 +30,8 @@ public function getHelpMeta(): array
         return [['Sum of the numbers in the column. Example: [1, 2, 3] => 6.'], []];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
-        return \array_sum($colValues);
+        return $colValues->sum();
     }
 }
diff --git a/src/Rules/Aggregate/ComboTrimean.php b/src/Rules/Aggregate/ComboTrimean.php
index d471b31f..6294ef2c 100644
--- a/src/Rules/Aggregate/ComboTrimean.php
+++ b/src/Rules/Aggregate/ComboTrimean.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use MathPHP\Statistics\Average;
 
@@ -38,7 +39,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    protected function getActualAggregate(array $colValues): ?float
+    protected function getActualAggregate(Vector $colValues): ?float
     {
         if (\count($colValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/First.php b/src/Rules/Aggregate/First.php
index 37c2c968..fbbfd633 100644
--- a/src/Rules/Aggregate/First.php
+++ b/src/Rules/Aggregate/First.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class First extends AbstractAggregateRule
@@ -30,7 +31,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/FirstNot.php b/src/Rules/Aggregate/FirstNot.php
index 5eecc1bf..e59c142e 100644
--- a/src/Rules/Aggregate/FirstNot.php
+++ b/src/Rules/Aggregate/FirstNot.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class FirstNot extends AbstractAggregateRule
@@ -35,7 +36,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/IsUnique.php b/src/Rules/Aggregate/IsUnique.php
index 86434e62..90dc1142 100644
--- a/src/Rules/Aggregate/IsUnique.php
+++ b/src/Rules/Aggregate/IsUnique.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class IsUnique extends AbstractAggregateRule
@@ -30,13 +31,13 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
         }
 
-        $uValuesCount = \count(\array_unique($columnValues));
+        $uValuesCount = \count(\array_unique($columnValues->toArray()));
         $valuesCount = \count($columnValues);
 
         if ($uValuesCount !== $valuesCount) {
diff --git a/src/Rules/Aggregate/Last.php b/src/Rules/Aggregate/Last.php
index 153911c7..b70521ff 100644
--- a/src/Rules/Aggregate/Last.php
+++ b/src/Rules/Aggregate/Last.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class Last extends AbstractAggregateRule
@@ -30,7 +31,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/LastNot.php b/src/Rules/Aggregate/LastNot.php
index 28358415..81a3b153 100644
--- a/src/Rules/Aggregate/LastNot.php
+++ b/src/Rules/Aggregate/LastNot.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class LastNot extends AbstractAggregateRule
@@ -35,7 +36,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/Nth.php b/src/Rules/Aggregate/Nth.php
index 9b6c150c..9552ec7e 100644
--- a/src/Rules/Aggregate/Nth.php
+++ b/src/Rules/Aggregate/Nth.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class Nth extends AbstractAggregateRule
@@ -34,7 +35,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/NthNot.php b/src/Rules/Aggregate/NthNot.php
index 8870d7b8..3eb51cdd 100644
--- a/src/Rules/Aggregate/NthNot.php
+++ b/src/Rules/Aggregate/NthNot.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 
 final class NthNot extends AbstractAggregateRule
@@ -39,7 +40,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Aggregate/Sorted.php b/src/Rules/Aggregate/Sorted.php
index 66104cbb..369f8953 100644
--- a/src/Rules/Aggregate/Sorted.php
+++ b/src/Rules/Aggregate/Sorted.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Aggregate;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use JBZoo\CsvBlueprint\Utils;
 
@@ -50,7 +51,7 @@ public function getHelpMeta(): array
         ];
     }
 
-    public function validateRule(array $columnValues): ?string
+    public function validateRule(Vector $columnValues): ?string
     {
         if (\count($columnValues) === 0) {
             return null;
diff --git a/src/Rules/Ruleset.php b/src/Rules/Ruleset.php
index b04ba9d0..0142aa00 100644
--- a/src/Rules/Ruleset.php
+++ b/src/Rules/Ruleset.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Rules;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Rules\Cell\AbstractCellRuleCombo;
 use JBZoo\CsvBlueprint\Utils;
 use JBZoo\CsvBlueprint\Validators\ErrorSuite;
@@ -43,7 +44,7 @@ public function __construct(array $rules, string $columnNameId)
         }
     }
 
-    public function validateRuleSet(array|string $cellValue, int $line, int $linesToAggregate = 0): ErrorSuite
+    public function validateRuleSet(string|Vector $cellValue, int $line, int $linesToAggregate = 0): ErrorSuite
     {
         $errors = new ErrorSuite();
 
diff --git a/src/Validators/ValidatorColumn.php b/src/Validators/ValidatorColumn.php
index 12644bd5..fa0beeed 100644
--- a/src/Validators/ValidatorColumn.php
+++ b/src/Validators/ValidatorColumn.php
@@ -16,6 +16,7 @@
 
 namespace JBZoo\CsvBlueprint\Validators;
 
+use Ds\Vector;
 use JBZoo\CsvBlueprint\Csv\Column;
 use JBZoo\CsvBlueprint\Rules\AbstarctRule;
 use JBZoo\CsvBlueprint\Rules\Ruleset;
@@ -40,7 +41,7 @@ public function validateCell(string $cellValue, int $line): ErrorSuite
         return $this->cellRuleset->validateRuleSet($cellValue, $line);
     }
 
-    public function validateList(array $cellValue, int $linesToAggregate): ErrorSuite
+    public function validateList(Vector $cellValue, int $linesToAggregate): ErrorSuite
     {
         return $this->aggRuleset->validateRuleSet($cellValue, self::FALLBACK_LINE, $linesToAggregate);
     }
diff --git a/src/Validators/ValidatorCsv.php b/src/Validators/ValidatorCsv.php
index 5a0a941f..4bf90260 100644
--- a/src/Validators/ValidatorCsv.php
+++ b/src/Validators/ValidatorCsv.php
@@ -112,7 +112,7 @@ private function validateLines(bool $quickStop = false): ErrorSuite
         foreach ($mappedColumns as $columnIndex => $column) {
             $messPrefix = "<i>Column</i> \"{$column->getHumanName()}\" -"; // System message prefix. Debug only!
 
-            $columValues = [];
+            $columValues = new \Ds\Vector();
 
             Utils::debug("{$messPrefix} Column start");
             $colValidator = $column->getValidator();
diff --git a/tests/Commands/ValidateCsvBasicTest.php b/tests/Commands/ValidateCsvBasicTest.php
index 5ccc7ffb..811cd571 100644
--- a/tests/Commands/ValidateCsvBasicTest.php
+++ b/tests/Commands/ValidateCsvBasicTest.php
@@ -32,7 +32,7 @@ public function testValidateOneCsvPositive(): void
             'schema' => Tools::DEMO_YML_VALID,
         ]);
 
-        $expected = $expected = <<<'TXT'
+        $expected = <<<'TXT'
             CSV Blueprint: Unknown version (PhpUnit)
             Found Schemas   : 1
             Found CSV files : 1