diff --git a/docs/Experiment.md b/docs/Experiment.md
index 7780164..29cfcc6 100644
--- a/docs/Experiment.md
+++ b/docs/Experiment.md
@@ -267,7 +267,7 @@ This is the percentual chance that a new user will be included in the experiment
 **Description**
 
 ```php
-public setAllocation (int $percent)
+public setAllocation (int|string $percent)
 ```
 
 Set experiment allocation 
@@ -276,7 +276,7 @@ This is the percentual chance that a new user will be included in the experiment
 
 **Parameters**
 
-* `(int) $percent`
+* `(int|string) $percent`
 
 **Return Values**
 
@@ -300,4 +300,4 @@ Return a Result instance from the current experiment
 
 **Return Values**
 
-`Result`
\ No newline at end of file
+`Result`
diff --git a/docs/Group.md b/docs/Group.md
index 1494ebf..2fbf07a 100644
--- a/docs/Group.md
+++ b/docs/Group.md
@@ -152,14 +152,14 @@ Get group views
 **Description**
 
 ```php
-public setViews (int $views)
+public setViews (int|string $views)
 ```
 
 Set group views 
 
 **Parameters**
 
-* `(int) $views`
+* `(int|string) $views`
 
 **Return Values**
 
@@ -192,14 +192,14 @@ Get number of conversions for the group
 **Description**
 
 ```php
-public setConversions (int $conversions)
+public setConversions (int|string $conversions)
 ```
 
 Set number of conversions for the group 
 
 **Parameters**
 
-* `(int) $conversions`
+* `(int|string) $conversions`
 
 **Return Values**
 
@@ -334,14 +334,14 @@ Returns 0 for control, 1 for variation and null when type is unknown
 **Description**
 
 ```php
-public isType (int $type)
+public isType (int|string $type)
 ```
 
-Get whether the variation is a specific type 
+Get whether the variation is a specific type (0 or 1)
 
 **Parameters**
 
-* `(int) $type`
+* `(int|string) $type`
 
 **Return Values**
 
@@ -354,14 +354,14 @@ Get whether the variation is a specific type
 **Description**
 
 ```php
-public setType (int $type)
+public setType (int|string $type)
 ```
 
-Set group type 
+Set group type (0 or 1)
 
 **Parameters**
 
-* `(int) $type`
+* `(int|string) $type`
 
 **Return Values**
 
@@ -445,4 +445,4 @@ Define the group as the variation
 
 **Return Values**
 
-`self`
\ No newline at end of file
+`self`
diff --git a/docs/Result.md b/docs/Result.md
index 19dabca..859e503 100644
--- a/docs/Result.md
+++ b/docs/Result.md
@@ -42,14 +42,14 @@ Get the specified minimum confidence
 **Description**
 
 ```php
-public setMinimumConfidence (float $confidence)
+public setMinimumConfidence (float|string $confidence)
 ```
 
 Set the minimum confidence 
 
 **Parameters**
 
-* `(float) $confidence`
+* `(float|string) $confidence`
 
 **Return Values**
 
@@ -82,14 +82,14 @@ Get the specified minimum detectable effect
 **Description**
 
 ```php
-public setMinimumDetectableEffect (float $effect)
+public setMinimumDetectableEffect (float|string $effect)
 ```
 
 Set the minimum detectable effect 
 
 **Parameters**
 
-* `(float) $effect`
+* `(float|string) $effect`
 
 **Return Values**
 
@@ -263,4 +263,4 @@ Get complete results
 
 **Return Values**
 
-`object`
\ No newline at end of file
+`object`
diff --git a/docs/Token.md b/docs/Token.md
index cdc8b0c..4199df3 100644
--- a/docs/Token.md
+++ b/docs/Token.md
@@ -123,7 +123,7 @@ Set tracking token value
 **Description**
 
 ```php
-public setCookie (string|null $value, int|null $expires)
+public setCookie (string|null $value, int|string|null $expires)
 ```
 
 Set tracking cookie with the token name and value 
@@ -134,7 +134,7 @@ This sends a cookie to the users browser with the configured settings (and if pa
 
 * `(string|null) $value`
 : Defaults to configured value  
-* `(int|null) $expires`
+* `(int|string|null) $expires`
 : Defaults to current time plus configured max age
 
 **Return Values**
@@ -161,4 +161,4 @@ This sends a cookie to the users browser with the configured settings, but with
 
 **Return Values**
 
-`self`
\ No newline at end of file
+`self`
diff --git a/docs/User.md b/docs/User.md
index 2eb4dc9..047418e 100644
--- a/docs/User.md
+++ b/docs/User.md
@@ -88,14 +88,14 @@ Get all user experiments
 **Description**
 
 ```php
-public hasExperiment (Experiment|int $experiment)
+public hasExperiment (Experiment|int|string $experiment)
 ```
 
 Return whether the user has an experiment in the list, regardless of whether the user actually is part of it 
 
 **Parameters**
 
-* `(Experiment|int) $experiment`
+* `(Experiment|int|string) $experiment`
 : Experiment instance or ID  
 
 **Return Values**
@@ -109,16 +109,16 @@ Return whether the user has an experiment in the list, regardless of whether the
 **Description**
 
 ```php
-public isParticipant (Experiment|int $experiment, int|null $group)
+public isParticipant (Experiment|int|string $experiment, int|string|null $group)
 ```
 
 Return whether the user is a participant of an experiment, and optionally, part of a specific group
 
 **Parameters**
 
-* `(Experiment|int) $experiment`
+* `(Experiment|int|string) $experiment`
 : Experiment instance or ID  
-* `(int|null) $group`
+* `(int|string|null) $group`
 : Group type (0 or 1)  
 
 **Return Values**
@@ -132,14 +132,14 @@ Return whether the user is a participant of an experiment, and optionally, part
 **Description**
 
 ```php
-public inControl (Experiment|int $experiment)
+public inControl (Experiment|int|string $experiment)
 ```
 
 Return whether the user belongs to the control group of an experiment
 
 **Parameters**
 
-* `(Experiment|int) $experiment`
+* `(Experiment|int|string) $experiment`
 : Experiment instance or ID  
 
 **Return Values**
@@ -153,14 +153,14 @@ Return whether the user belongs to the control group of an experiment
 **Description**
 
 ```php
-public inVariation (Experiment|int $experiment)
+public inVariation (Experiment|int|string $experiment)
 ```
 
 Return whether the user belongs to the variation group of an experiment
 
 **Parameters**
 
-* `(Experiment|int) $experiment`
+* `(Experiment|int|string) $experiment`
 : Experiment instance or ID  
 
 **Return Values**
@@ -174,7 +174,7 @@ Return whether the user belongs to the variation group of an experiment
 **Description**
 
 ```php
-public addExperiment (Experiment|int $experiment, Group|null $group, bool $viewed, bool $converted)
+public addExperiment (Experiment|int|string $experiment, Group|null $group, bool $viewed, bool $converted)
 ```
 
 Add an experiment to the users list of experiments 
@@ -183,7 +183,7 @@ If no group is set, the experiment is added to to list without the user being as
 
 **Parameters**
 
-* `(Experiment|id) $experiment`
+* `(Experiment|id|string) $experiment`
 : Experiment instance or ID
 * `(Group|null) $group`
 * `(bool) $viewed`
@@ -242,14 +242,14 @@ If the experiments coverage is below 100, it's percentage value will be used to
 **Description**
 
 ```php
-public hasViewed (int $id)
+public hasViewed (int|string $id)
 ```
 
 Get whether a user has viewed a specific experiment 
 
 **Parameters**
 
-* `(int) $id`
+* `(int|string) $id`
 : Experiment ID  
 
 **Return Values**
@@ -263,14 +263,14 @@ Get whether a user has viewed a specific experiment
 **Description**
 
 ```php
-public setViewed (int $id, bool $viewed)
+public setViewed (int|string $id, bool $viewed)
 ```
 
 Set whether a user has viewed a specific experiment 
 
 **Parameters**
 
-* `(int) $id`
+* `(int|string) $id`
 : Experiment ID  
 * `(bool) $viewed`
 
@@ -285,14 +285,14 @@ Set whether a user has viewed a specific experiment
 **Description**
 
 ```php
-public hasConverted (int $id)
+public hasConverted (int|string $id)
 ```
 
 Get whether a user has converted in a specific experiment 
 
 **Parameters**
 
-* `(int) $id`
+* `(int|string) $id`
 : Experiment ID  
 
 **Return Values**
@@ -306,15 +306,15 @@ Get whether a user has converted in a specific experiment
 **Description**
 
 ```php
-public setConverted (int $id, bool $converted)
+public setConverted (int|string $id, bool $converted)
 ```
 
 Set whether a user has converted in a specific experiment 
 
 **Parameters**
 
-* `(int) $id`
+* `(int|string) $id`
 : Experiment ID  
 * `(bool) $converted`
 
-**Return Values**
\ No newline at end of file
+**Return Values**
diff --git a/src/Experiment.php b/src/Experiment.php
index a822785..78f0a84 100644
--- a/src/Experiment.php
+++ b/src/Experiment.php
@@ -115,11 +115,11 @@ public function setName($name)
      */
     private function mapGroup($key)
     {
-        if (is_string($key)) {
+        if (!is_numeric($key)) {
             $index = false;
 
             foreach ($this->groups as $i => $group) {
-                if ($group->getName() == $key) {
+                if ($group->getName() === $key) {
                     $index = $i;
                 }
             }
@@ -131,7 +131,7 @@ private function mapGroup($key)
             return $index;
         }
 
-        return $key;
+        return (int)$key;
     }
 
     /**
@@ -252,12 +252,14 @@ public function getAllocation()
      * 
      * This is the percentual chance that a new user will be included in the experiment
      *
-     * @param int $percent
+     * @param int|string $percent
      * 
      * @return self
      */
     public function setAllocation($percent)
     {
+        $percent = (int)$percent;
+
         if ($percent < 0 || $percent > 100) {
             throw new \Exception('Invalid $percent (value must be between 0 and 100)');
         }
@@ -276,4 +278,4 @@ public function getResult()
     {
         return new Result($this);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Group.php b/src/Group.php
index d404168..c661943 100644
--- a/src/Group.php
+++ b/src/Group.php
@@ -102,13 +102,13 @@ public function getViews()
     /**
      * Set group views
      * 
-     * @param int $views
+     * @param int|string $views
      * 
      * @return self
      */
     public function setViews($views)
     {
-        return $this->setValue('views', $views);
+        return $this->setValue('views', (int)$views);
     }
 
     /**
@@ -124,13 +124,13 @@ public function getConversions()
     /**
      * Set number of conversions for the group
      * 
-     * @param int $conversions
+     * @param int|string $conversions
      * 
      * @return self
      */
     public function setConversions($conversions)
     {
-        return $this->setValue('conversions', $conversions);
+        return $this->setValue('conversions', (int)$conversions);
     }
 
     /**
@@ -203,27 +203,27 @@ public function getType()
     }
 
     /**
-     * Get whether the variation is a specific type
+     * Get whether the variation is a specific type (0 or 1)
      * 
-     * @param int $type
+     * @param int|string $type
      * 
      * @return bool
      */
-    public function isType(int $type)
+    public function isType($type)
     {
-        return $this->getType() === $type;
+        return $this->getType() === (int)$type;
     }
 
     /**
-     * Set group type
+     * Set group type (0 or 1)
      * 
-     * @param int $type
+     * @param int|string $type
      * 
      * @return self
      */
-    public function setType(int $type)
+    public function setType($type)
     {
-        return $this->setValue('type', $type);
+        return $this->setValue('type', (int)$type);
     }
 
     /**
@@ -265,4 +265,4 @@ public function setVariation()
     {
         return $this->setType(1);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Result.php b/src/Result.php
index 8433041..f6ad50a 100644
--- a/src/Result.php
+++ b/src/Result.php
@@ -246,13 +246,13 @@ public function getMinimumConfidence()
     /**
      * Set the minimum confidence
      * 
-     * @param float $confidence
+     * @param float|string $confidence
      * 
      * @return self
      */
     public function setMinimumConfidence($confidence)
     {
-        $this->minimumConfidence = $confidence;
+        $this->minimumConfidence = (float)$confidence;
 
         return $this;
     }
@@ -270,13 +270,13 @@ public function getMinimumDetectableEffect()
     /**
      * Set the minimum detectable effect
      * 
-     * @param float $effect
+     * @param float|string $effect
      * 
      * @return self
      */
     public function setMinimumDetectableEffect($effect)
     {
-        $this->minimumDetectableEffect = $effect;
+        $this->minimumDetectableEffect = (float)$effect;
 
         return $this;
     }
@@ -423,4 +423,4 @@ public function getAll()
             'significant' => $this->significant
         ];
     }
-}
\ No newline at end of file
+}
diff --git a/src/Token.php b/src/Token.php
index 62f7885..27c72d6 100644
--- a/src/Token.php
+++ b/src/Token.php
@@ -112,7 +112,7 @@ public function generate($id = null)
      * passed, a custom value and expires timestamp)
      *
      * @param string|null $value Defaults to configured value
-     * @param int|null $expires Defaults to current time plus configured max age
+     * @param int|string|null $expires Defaults to current time plus configured max age
      * 
      * @return self
      */
@@ -152,4 +152,4 @@ public function removeCookie()
     {
         return $this->setCookie(false, 1);
     }
-}
\ No newline at end of file
+}
diff --git a/src/User.php b/src/User.php
index 834aa9a..2724175 100644
--- a/src/User.php
+++ b/src/User.php
@@ -93,16 +93,16 @@ public function hasExperiment($experiment)
     {
         if ($experiment instanceof Experiment) {
             $id = $experiment->getID();
-        } else if (is_int($experiment)) {
-            $id = $experiment;
+        } else if (is_numeric($experiment)) {
+            $id = (int)$experiment;
         } else {
             throw new \Exception(
-                'Invalid $experiment (type must be Abby\Experiment or int)'
+                'Invalid $experiment (type must be Abby\Experiment or number)'
             );
         }
 
         foreach ($this->experiments as $item) {
-            if ($item->id == $id) {
+            if ($item->id === $id) {
                 return true;
             }
         }
@@ -114,8 +114,8 @@ public function hasExperiment($experiment)
      * Return whether the user is a participant of an experiment (belongs to
      * either of the groups), and if passed, part of a specific group
      * 
-     * @param Experiment|int $experiment Experiment instance or ID
-     * @param int|null $group Group type (0 or 1)
+     * @param Experiment|int|string $experiment Experiment instance or ID
+     * @param int|string|null $group Group type (0 or 1)
      * 
      * @return bool
      */
@@ -123,19 +123,19 @@ public function isParticipant($experiment, $group = null)
     {
         if ($experiment instanceof Experiment) {
             $id = $experiment->getID();
-        } else if (is_int($experiment)) {
-            $id = $experiment;
+        } else if (is_numeric($experiment)) {
+            $id = (int)$experiment;
         } else {
             throw new \Exception(
-                'Invalid $experiment (type must be Abby\Experiment or int)'
+                'Invalid $experiment (type must be Abby\Experiment or number)'
             );
         }
 
         foreach ($this->experiments as $item) {
-            if ($item->id == $id) {
+            if ($item->id === $id) {
                 if ($group === null && $item->group !== null) {
                     return true;
-                } else if ($group !== null && $item->group === $group) {
+                } else if ($group !== null && $item->group === (int)$group) {
                     return true;
                 }
             }
@@ -147,7 +147,7 @@ public function isParticipant($experiment, $group = null)
     /**
      * Return whether the user belongs to the control group of an experiment
      * 
-     * @param Experiment|int $experiment Experiment instance or ID
+     * @param Experiment|int|string $experiment Experiment instance or ID
      * 
      * @return bool
      */
@@ -159,7 +159,7 @@ public function inControl($experiment)
     /**
      * Return whether the user belongs to the variation group of an experiment
      * 
-     * @param Experiment|int $experiment Experiment instance or ID
+     * @param Experiment|int|string $experiment Experiment instance or ID
      * 
      * @return bool
      */
@@ -173,7 +173,7 @@ public function inVariation($experiment)
      * 
      * If no group is set, the experiment is added to to list without the user being assigned a group
      * 
-     * @param Experiment|int $experiment Experiment instance or ID
+     * @param Experiment|int|string $experiment Experiment instance or ID
      * @param Group|null $group
      * @param bool $converted
      * 
@@ -187,11 +187,11 @@ public function addExperiment(
     ) {
         if ($experiment instanceof Experiment) {
             $id = $experiment->getID();
-        } else if (is_int($experiment)) {
-            $id = $experiment;
+        } else if (is_numeric($experiment)) {
+            $id = (int)$experiment;
         } else {
             throw new \Exception(
-                'Invalid $experiment (type must be Abby\Experiment or int)'
+                'Invalid $experiment (type must be Abby\Experiment or number)'
             );
         }
 
@@ -205,8 +205,8 @@ public function addExperiment(
 
         // Only set viewed and converted values if the user is part of an experiment group
         if ($group) {
-            $userExperiment->viewed = $viewed;
-            $userExperiment->converted = $converted;
+            $userExperiment->viewed = (bool)$viewed;
+            $userExperiment->converted = (bool)$converted;
         }
 
         // Add to list of experiments
@@ -229,7 +229,7 @@ public function shouldParticipate(Experiment $experiment)
         $allocation = $experiment->getAllocation();
 
         // Return true if allocation is 100%
-        if ($allocation == 100) {
+        if ($allocation === 100) {
             return true;
         }
 
@@ -271,14 +271,14 @@ public function assignGroup(Experiment $experiment)
     /**
      * Get whether a user has viewed a specific experiment
      * 
-     * @param int $id Experiment ID
+     * @param int|string $id Experiment ID
      * 
      * @return bool
      */
     public function hasViewed($id)
     {
         foreach ($this->experiments as $i => $experiment) {
-            if ($experiment->id == $id) {
+            if ($experiment->id === (int)$id) {
                 if ($this->experiments[$i]->viewed) {
                     return true;
                 }
@@ -291,7 +291,7 @@ public function hasViewed($id)
     /**
      * Set whether a user has viewed a specific experiment
      * 
-     * @param int $id Experiment ID
+     * @param int|string $id Experiment ID
      * @param bool $viewed
      * 
      * @return self
@@ -299,7 +299,7 @@ public function hasViewed($id)
     public function setViewed($id, $viewed = true)
     {
         foreach ($this->experiments as $i => $experiment) {
-            if ($experiment->id == $id) {
+            if ($experiment->id === (int)$id) {
                 $this->experiments[$i]->viewed = $viewed;
             }
         }
@@ -310,14 +310,14 @@ public function setViewed($id, $viewed = true)
     /**
      * Get whether a user has converted in a specific experiment
      * 
-     * @param int $id Experiment ID
+     * @param int|string $id Experiment ID
      * 
      * @return bool
      */
     public function hasConverted($id)
     {
         foreach ($this->experiments as $i => $experiment) {
-            if ($experiment->id == $id) {
+            if ($experiment->id === (int)$id) {
                 if ($this->experiments[$i]->converted) {
                     return true;
                 }
@@ -330,7 +330,7 @@ public function hasConverted($id)
     /**
      * Set whether a user has converted in a specific experiment
      * 
-     * @param int $id Experiment ID
+     * @param int|string $id Experiment ID
      * @param bool $converted
      * 
      * @return self
@@ -338,7 +338,7 @@ public function hasConverted($id)
     public function setConverted($id, $converted = true)
     {
         foreach ($this->experiments as $i => $experiment) {
-            if ($experiment->id == $id) {
+            if ($experiment->id === (int)$id) {
                 $this->experiments[$i]->converted = $converted;
             }
         }