diff --git a/src/CliProgram/Validation/Validators/AbstractDateTimeValidator.php b/src/CliProgram/Validation/Validators/AbstractDateTimeValidator.php
index 7690ead..1460bd7 100644
--- a/src/CliProgram/Validation/Validators/AbstractDateTimeValidator.php
+++ b/src/CliProgram/Validation/Validators/AbstractDateTimeValidator.php
@@ -7,7 +7,7 @@ use DateTimeInterface;
 /**
  * An argument/option value validator expecting a date and/or time
  *
- * @template-implements BasedValidator<RegexValidator>
+ * @extends BasedValidator<DateTimeInterface, RegexValidator>
  */
 abstract class AbstractDateTimeValidator extends BasedValidator {
     /**
diff --git a/src/CliProgram/Validation/Validators/AssociativeListValidator.php b/src/CliProgram/Validation/Validators/AssociativeListValidator.php
new file mode 100644
index 0000000..d9555d0
--- /dev/null
+++ b/src/CliProgram/Validation/Validators/AssociativeListValidator.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace jrosset\CliProgram\Validation\Validators;
+
+use Arrayy\Type\StringCollection;
+use Closure;
+
+/**
+ * An argument/option value validator based on an associative list of value
+ *
+ * Key = User input
+ * <br>Value = Real value (see {@see IValidator::getValue() getValue()})
+ *
+ * @implements IValidatorWithSuggestions<string>
+ */
+class AssociativeListValidator implements IValidatorWithSuggestions {
+    use TIdenticalValidDefaultValidator;
+
+    /**
+     * @use TInternalValueValidator<string>
+     */
+    use TInternalValueValidator;
+
+    /**
+     * @var StringCollection The list of allowed values
+     */
+    private StringCollection $allowedValues;
+
+    /**
+     * Create a validator
+     *
+     * @param StringCollection|null $allowedValues The list of allowed values
+     */
+    public function __construct (?StringCollection $allowedValues = null) {
+        $this->setAllowedValues($allowedValues ?? new StringCollection());
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function validate (mixed $value): bool {
+        if ($this->allowedValues->keyExists($value)) {
+            $this->setValue($this->allowedValues->get($value));
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * The list of allowed values
+     *
+     * @return StringCollection The list of allowed values
+     */
+    public function getAllowedValues (): StringCollection {
+        return $this->allowedValues;
+    }
+    /**
+     * Set the list of allowed values
+     *
+     * @param StringCollection $allowedValues The list of allowed values
+     *
+     * @return $this
+     */
+    public function setAllowedValues (StringCollection $allowedValues): self {
+        $this->allowedValues = $allowedValues;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getSuggestions (): Closure|array {
+        return $this->getAllowedValues()->getKeys()->toArray();
+    }
+}
\ No newline at end of file
diff --git a/src/CliProgram/Validation/Validators/BasedValidator.php b/src/CliProgram/Validation/Validators/BasedValidator.php
index c7a5fe6..eefe133 100644
--- a/src/CliProgram/Validation/Validators/BasedValidator.php
+++ b/src/CliProgram/Validation/Validators/BasedValidator.php
@@ -5,7 +5,10 @@ namespace jrosset\CliProgram\Validation\Validators;
 /**
  * An argument/option value validator based on another, internal, validator
  *
- * @template TValidator of IValidator
+ * @template TValue of mixed The type of the returned value
+ * @template TValidator of IValidator The type of the internal validator
+ *
+ * @extends IValidator<TValue>
  */
 abstract class BasedValidator implements IValidator {
     /**
diff --git a/src/CliProgram/Validation/Validators/DateTimeValidator.php b/src/CliProgram/Validation/Validators/DateTimeValidator.php
index c69d04c..aed2050 100644
--- a/src/CliProgram/Validation/Validators/DateTimeValidator.php
+++ b/src/CliProgram/Validation/Validators/DateTimeValidator.php
@@ -7,8 +7,6 @@ use DateTimeInterface;
 
 /**
  * An argument/option value validator expecting a date and time
- *
- * @template-implements BasedValidator<RegexValidator>
  */
 class DateTimeValidator extends AbstractDateTimeValidator {
     /**
diff --git a/src/CliProgram/Validation/Validators/DateValidator.php b/src/CliProgram/Validation/Validators/DateValidator.php
index cc4595f..aea55a1 100644
--- a/src/CliProgram/Validation/Validators/DateValidator.php
+++ b/src/CliProgram/Validation/Validators/DateValidator.php
@@ -7,8 +7,6 @@ use DateTimeInterface;
 
 /**
  * An argument/option value validator expecting a date (without time)
- *
- * @template-implements BasedValidator<RegexValidator>
  */
 class DateValidator extends AbstractDateTimeValidator {
     /**
diff --git a/src/CliProgram/Validation/Validators/DecimalValidator.php b/src/CliProgram/Validation/Validators/DecimalValidator.php
index 13f8eef..743140f 100644
--- a/src/CliProgram/Validation/Validators/DecimalValidator.php
+++ b/src/CliProgram/Validation/Validators/DecimalValidator.php
@@ -7,11 +7,14 @@ use InvalidArgumentException;
 /**
  * An argument/option value validator expecting a decimal
  *
- * @template-implements BasedValidator<RegexValidator>
- * @template-implements TInternalValueValidator<float>
+ * @extends BasedValidator<float, RegexValidator>
  */
 class DecimalValidator extends BasedValidator {
     use TIdenticalValidDefaultValidator;
+
+    /**
+     * @use TInternalValueValidator<float>
+     */
     use TInternalValueValidator;
 
     /**
@@ -47,8 +50,8 @@ class DecimalValidator extends BasedValidator {
 
         parent::__construct(
             new RegexValidator(
-            /** @lang PhpRegExp */ '/^(?<int>[+-]?(?:\d{1,3}' . $this->thousandsSeparator . '?(?:\d{3}' . $this->thousandsSeparator . '?)*\d{3}|\d{1,3}))(?:' . $this->decimalSeparator
-                                   . '(?<dec>\d+))?$/'
+            /** @lang PhpRegExp */
+                "/^(?<int>[+-]?(?:\\d{1,3}$this->thousandsSeparator?(?:\\d{3}$this->thousandsSeparator?)*\\d{3}|\\d{1,3}))(?:$this->decimalSeparator(?<dec>\\d+))?\$/"
             )
         );
     }
diff --git a/src/CliProgram/Validation/Validators/DirectoryValidator.php b/src/CliProgram/Validation/Validators/DirectoryValidator.php
index 86f9d3c..cb699c1 100644
--- a/src/CliProgram/Validation/Validators/DirectoryValidator.php
+++ b/src/CliProgram/Validation/Validators/DirectoryValidator.php
@@ -11,8 +11,13 @@ use Symfony\Component\Console\Completion\CompletionInput;
 
 /**
  * An argument/option value validator for a directory path
+ *
+ * @implements IValidatorWithSuggestions<string>
  */
 class DirectoryValidator implements IValidatorWithSuggestions {
+    /**
+     * @use TInternalValueValidator<string>
+     */
     use TInternalValueValidator;
 
     /**
@@ -80,7 +85,7 @@ class DirectoryValidator implements IValidatorWithSuggestions {
             return false;
         }
 
-        $this->setValue($value);
+        $this->setValue((string)$value);
         return true;
     }
 
diff --git a/src/CliProgram/Validation/Validators/EmailValidator.php b/src/CliProgram/Validation/Validators/EmailValidator.php
index 3b0a6bf..4b840db 100644
--- a/src/CliProgram/Validation/Validators/EmailValidator.php
+++ b/src/CliProgram/Validation/Validators/EmailValidator.php
@@ -4,11 +4,17 @@ namespace jrosset\CliProgram\Validation\Validators;
 
 /**
  * An argument/option value validator expecting an email address
+ *
+ * @implements IValidator<string>
  */
 class EmailValidator implements IValidator {
-    use TInternalValueValidator;
     use TIdenticalValidDefaultValidator;
 
+    /**
+     * @use TInternalValueValidator<string>
+     */
+    use TInternalValueValidator;
+
     /**
      * @inheritDoc
      */
diff --git a/src/CliProgram/Validation/Validators/EnumValidator.php b/src/CliProgram/Validation/Validators/EnumValidator.php
index 69cf04f..12c91df 100644
--- a/src/CliProgram/Validation/Validators/EnumValidator.php
+++ b/src/CliProgram/Validation/Validators/EnumValidator.php
@@ -13,8 +13,9 @@ use UnitEnum;
  * An argument/option value validator based on an enumeration
  *
  * @template TEnum of UnitEnum
- * @template-implements IValidator<TEnum>
- * @template-implements TInternalValueValidator<TEnum>
+ *
+ * @extends BasedValidator<TEnum, ListValidator>
+ * @implements IValidatorWithSuggestions<TEnum>
  */
 class EnumValidator extends BasedValidator implements IValidatorWithSuggestions {
     /**
@@ -53,10 +54,14 @@ class EnumValidator extends BasedValidator implements IValidatorWithSuggestions
     /**
      * @inheritDoc
      *
+     * @return TEnum|null The value
+     *
      * @throws ReflectionException
      */
-    public function getValue (): UnitEnum {
-        $enumCase = $this->getInternalValidator()->getValue();
+    public function getValue (): ?UnitEnum {
+        if (($enumCase = $this->getInternalValidator()->getValue()) === null) {
+            return null;
+        }
         return $this->enum->getCase($enumCase)->getValue();
     }
 
diff --git a/src/CliProgram/Validation/Validators/FilesystemValidationOptionsList.php b/src/CliProgram/Validation/Validators/FilesystemValidationOptionsList.php
index a02a673..4fa26da 100644
--- a/src/CliProgram/Validation/Validators/FilesystemValidationOptionsList.php
+++ b/src/CliProgram/Validation/Validators/FilesystemValidationOptionsList.php
@@ -5,7 +5,7 @@ namespace jrosset\CliProgram\Validation\Validators;
 use Arrayy\Collection\AbstractCollection;
 
 /**
- * A list of options of a filesystem based validator
+ * A list of options of a filesystem-based validator
  *
  * @extends AbstractCollection<FilesystemValidationOption>
  */
diff --git a/src/CliProgram/Validation/Validators/IValidator.php b/src/CliProgram/Validation/Validators/IValidator.php
index 19ecb2c..97e8256 100644
--- a/src/CliProgram/Validation/Validators/IValidator.php
+++ b/src/CliProgram/Validation/Validators/IValidator.php
@@ -5,7 +5,7 @@ namespace jrosset\CliProgram\Validation\Validators;
 /**
  * An argument/option value validator
  *
- * @template TValue The Type of the returned value
+ * @template TValue of mixed The type of the returned value
  */
 interface IValidator {
     /**
@@ -26,9 +26,9 @@ interface IValidator {
      */
     public function validate (mixed $value): bool;
     /**
-     * Get the value, after it's validation
+     * Get the value, after the validation
      *
      * @return TValue|null The value
      */
-    public function getValue ();
+    public function getValue (): mixed;
 }
\ No newline at end of file
diff --git a/src/CliProgram/Validation/Validators/IValidatorWithSuggestions.php b/src/CliProgram/Validation/Validators/IValidatorWithSuggestions.php
index 256d0b7..90f0f8a 100644
--- a/src/CliProgram/Validation/Validators/IValidatorWithSuggestions.php
+++ b/src/CliProgram/Validation/Validators/IValidatorWithSuggestions.php
@@ -10,7 +10,8 @@ use Symfony\Component\Console\Completion\Suggestion;
 /**
  * An argument/option value validator
  *
- * @template TValue The Type of the returned value
+ * @template TValue of mixed The type of the returned value
+ *
  * @extends IValidator<TValue>
  */
 interface IValidatorWithSuggestions extends IValidator {
diff --git a/src/CliProgram/Validation/Validators/IntegerValidator.php b/src/CliProgram/Validation/Validators/IntegerValidator.php
index 51821cf..310ff0d 100644
--- a/src/CliProgram/Validation/Validators/IntegerValidator.php
+++ b/src/CliProgram/Validation/Validators/IntegerValidator.php
@@ -7,11 +7,14 @@ use InvalidArgumentException;
 /**
  * An argument/option value validator expecting an integer
  *
- * @template-implements BasedValidator<RegexValidator>
- * @template-implements TInternalValueValidator<int>
+ * @extends BasedValidator<int, RegexValidator>
  */
 class IntegerValidator extends BasedValidator {
     use TIdenticalValidDefaultValidator;
+
+    /**
+     * @use TInternalValueValidator<int>
+     */
     use TInternalValueValidator;
 
     /**
@@ -42,7 +45,7 @@ class IntegerValidator extends BasedValidator {
 
         parent::__construct(
             new RegexValidator(
-            /** @lang PhpRegExp */ '/^[+-]?(?:\d{1,3}' . $this->thousandsSeparator . '?(?:\d{3}' . $this->thousandsSeparator . '?)*\d{3}|\d{1,3})$/'
+            /** @lang PhpRegExp */ "/^[+-]?(?:\\d{1,3}$this->thousandsSeparator?(?:\\d{3}$this->thousandsSeparator?)*\\d{3}|\\d{1,3})\$/"
             )
         );
     }
diff --git a/src/CliProgram/Validation/Validators/ListValidator.php b/src/CliProgram/Validation/Validators/ListValidator.php
index 546871a..cbe6ab7 100644
--- a/src/CliProgram/Validation/Validators/ListValidator.php
+++ b/src/CliProgram/Validation/Validators/ListValidator.php
@@ -3,68 +3,25 @@
 namespace jrosset\CliProgram\Validation\Validators;
 
 use Arrayy\Type\StringCollection;
-use Closure;
 
 /**
  * An argument/option value validator based on a list of value
- *
- * @template TValue
- * @template-implements IValidator<TValue>
- * @template-implements TInternalValueValidator<TValue>
  */
-class ListValidator implements IValidatorWithSuggestions {
-    use TIdenticalValidDefaultValidator;
-    use TInternalValueValidator;
-
-    /**
-     * @var StringCollection The list of allowed values
-     */
-    private StringCollection $allowedValues;
-
+class ListValidator extends AssociativeListValidator {
     /**
      * Create a validator
      *
      * @param StringCollection|null $allowedValues The list of allowed values
      */
     public function __construct (?StringCollection $allowedValues = null) {
-        $this->setAllowedValues($allowedValues ?? new StringCollection());
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function validate (mixed $value): bool {
-        if ($this->getAllowedValues()->contains($value)) {
-            $this->setValue($value);
-            return true;
+        //region Rebuild the allowed values collection with key = value
+        $realAllowedValues = new StringCollection();
+        if ($allowedValues !== null) {
+            foreach ($allowedValues as $value) {
+                $realAllowedValues->add($value, $value);
+            }
         }
-        return false;
-    }
-
-    /**
-     * The list of allowed values
-     *
-     * @return StringCollection The list of allowed values
-     */
-    public function getAllowedValues (): StringCollection {
-        return $this->allowedValues;
-    }
-    /**
-     * Set the list of allowed values
-     *
-     * @param StringCollection $allowedValues The list of allowed values
-     *
-     * @return $this
-     */
-    public function setAllowedValues (StringCollection $allowedValues): self {
-        $this->allowedValues = $allowedValues;
-        return $this;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function getSuggestions (): Closure|array {
-        return $this->getAllowedValues()->toArray();
+        //endregion
+        parent::__construct($realAllowedValues);
     }
 }
diff --git a/src/CliProgram/Validation/Validators/RegexValidator.php b/src/CliProgram/Validation/Validators/RegexValidator.php
index ec99856..24ac8b7 100644
--- a/src/CliProgram/Validation/Validators/RegexValidator.php
+++ b/src/CliProgram/Validation/Validators/RegexValidator.php
@@ -4,6 +4,8 @@ namespace jrosset\CliProgram\Validation\Validators;
 
 /**
  * An argument/option value validator based on a regex
+ *
+ * @implements IValidator<string>
  */
 class RegexValidator implements IValidator {
     use TIdenticalValidDefaultValidator;
@@ -87,6 +89,8 @@ class RegexValidator implements IValidator {
 
     /**
      * @inheritDoc
+     *
+     * @return string|null The value or Null if not set
      */
     public function getValue (): ?string {
         return $this->getMatch(static::GROUP_VALUE) ?? $this->getMatch(0);
diff --git a/src/CliProgram/Validation/Validators/TInternalValueValidator.php b/src/CliProgram/Validation/Validators/TInternalValueValidator.php
index 111be89..662a3ce 100644
--- a/src/CliProgram/Validation/Validators/TInternalValueValidator.php
+++ b/src/CliProgram/Validation/Validators/TInternalValueValidator.php
@@ -8,31 +8,30 @@ namespace jrosset\CliProgram\Validation\Validators;
  *
  * Call {@see self::setValue()} to set the value
  *
- * @template TValue
- * @template-implements IValidator<TValue>
+ * @template TValue of mixed
  */
 trait TInternalValueValidator {
     /**
-     * @var TValue|null The current value, after it's validation
+     * @var TValue|null The current value, after the validation
      */
-    private $value = null;
+    private mixed $value = null;
 
     /**
-     * Get the value, after it's validation
+     * Get the value, after the validation
      *
      * @return TValue|null The value
      */
-    public function getValue () {
+    public function getValue (): mixed {
         return $this->value;
     }
     /**
      * Set the value
      *
-     * @param TValue $value The value (after it's validation)
+     * @param TValue $value The value (after the validation)
      *
      * @return $this
      */
-    protected function setValue ($value): static {
+    protected function setValue (mixed $value): static {
         $this->value = $value;
         return $this;
     }
diff --git a/src/CliProgram/Validation/Validators/TimeValidator.php b/src/CliProgram/Validation/Validators/TimeValidator.php
index 26ea54b..c96da3e 100644
--- a/src/CliProgram/Validation/Validators/TimeValidator.php
+++ b/src/CliProgram/Validation/Validators/TimeValidator.php
@@ -7,8 +7,6 @@ use DateTimeInterface;
 
 /**
  * An argument/option value validator expecting a date (without time)
- *
- * @template-implements BasedValidator<RegexValidator>
  */
 class TimeValidator extends AbstractDateTimeValidator {
     /**