diff --git a/Math/Numerics/Integration.php b/Math/Numerics/Integration.php
index 155781897..68d982694 100644
--- a/Math/Numerics/Integration.php
+++ b/Math/Numerics/Integration.php
@@ -140,8 +140,11 @@ class Integration
         $sum1 = 0.0;
         $sum2 = 0.0;
 
-        for ($i = 1; $i < $n; ++$i) {
+        for ($i = 0; $i < $n; ++$i) {
             $sum1 += $func($from + $h * $i + $h / 2.0);
+        }
+
+        for ($i = 1; $i < $n; ++$i) {
             $sum2 += $func($from + $h * $i);
         }
 
diff --git a/Stdlib/Base/Heap.php b/Stdlib/Base/Heap.php
index 4923b09aa..76bff0879 100644
--- a/Stdlib/Base/Heap.php
+++ b/Stdlib/Base/Heap.php
@@ -261,6 +261,8 @@ class Heap
     public function getNLargest(int $n) : array
     {
         $nodes = $this->nodes;
+        \uasort($nodes, $this->compare);
+
         return \array_slice(\array_reverse($nodes), 0, $n);
     }
 
@@ -276,6 +278,8 @@ class Heap
     public function getNSmallest(int $n): array
     {
         $nodes = $this->nodes;
+        \uasort($nodes, $this->compare);
+
         return \array_slice($nodes, 0, $n);
     }
 
diff --git a/Stdlib/Base/Location.php b/Stdlib/Base/Location.php
index 5133d5f8f..21b517537 100644
--- a/Stdlib/Base/Location.php
+++ b/Stdlib/Base/Location.php
@@ -31,7 +31,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   int
      * @since 1.0.0
      */
-    private int $id = 0;
+    protected int $id = 0;
 
     /**
      * Zip or postal.
@@ -39,7 +39,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   string
      * @since 1.0.0
      */
-    private string $postal = '';
+    protected string $postal = '';
 
     /**
      * Name of city.
@@ -47,7 +47,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   string
      * @since 1.0.0
      */
-    private string $city = '';
+    protected string $city = '';
 
     /**
      * Name of the country.
@@ -55,7 +55,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   string
      * @since 1.0.0
      */
-    private string $country = '';
+    protected string $country = '';
 
     /**
      * Street & district.
@@ -63,7 +63,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   string
      * @since 1.0.0
      */
-    private string $address = '';
+    protected string $address = '';
 
     /**
      * Address type
@@ -71,7 +71,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   int
      * @since 1.0.0
      */
-    private int $type = AddressType::HOME;
+    protected int $type = AddressType::HOME;
 
     /**
      * State.
@@ -79,7 +79,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   string
      * @since 1.0.0
      */
-    private string $state = '';
+    protected string $state = '';
 
     /**
      * Geo coordinates.
@@ -87,7 +87,7 @@ class Location implements \JsonSerializable, \Serializable
      * @var   float[]
      * @since 1.0.0
      */
-    private array $geo = ['lat' => 0, 'long' => 0];
+    protected array $geo = ['lat' => 0, 'long' => 0];
 
     /**
      * Get location id