diff --git a/DataStorage/Cache/Connection/RedisCache.php b/DataStorage/Cache/Connection/RedisCache.php
index 46613e979..3fdd6337e 100755
--- a/DataStorage/Cache/Connection/RedisCache.php
+++ b/DataStorage/Cache/Connection/RedisCache.php
@@ -131,10 +131,10 @@ final class RedisCache extends ConnectionAbstract
         }
 
         if ($expire > 0) {
-            return $this->con->set((string) $key, $this->build($value), $expire);
+            return $this->con->set((string) $key, $this->build($value), ['nx', 'ex' => $expire]);
         }
 
-        return $this->con->set((string) $key, $this->build($value));
+        return $this->con->set((string) $key, $this->build($value), ['nx']);
     }
 
     /**
diff --git a/Math/Number/Numbers.php b/Math/Number/Numbers.php
index 0b7945724..5a4bba289 100755
--- a/Math/Number/Numbers.php
+++ b/Math/Number/Numbers.php
@@ -139,9 +139,8 @@ final class Numbers
         }
 
         $exponent = ($number / $max) * $exp;
-        $mapped   = (\exp($exponent) - 1) / (\exp($exp) - 1) * 100;
-
-        return $mapped;
+        
+        return (\exp($exponent) - 1) / (\exp($exp) - 1) * 100;
     }
 
     /**
diff --git a/tests/Stdlib/Graph/GraphTest.php b/tests/Stdlib/Graph/GraphTest.php
index 1a97f7eb7..5e33bf1e4 100755
--- a/tests/Stdlib/Graph/GraphTest.php
+++ b/tests/Stdlib/Graph/GraphTest.php
@@ -861,7 +861,7 @@ final class GraphTest extends \PHPUnit\Framework\TestCase
 
     /**
      *     1 - 3 - 5
-     *   / |\     /
+     *     |\     /
      * 0   | \   /
      *   \ |  \ /
      *     2   4
@@ -883,7 +883,6 @@ final class GraphTest extends \PHPUnit\Framework\TestCase
         $this->graph->setNode($node4);
         $this->graph->setNode($node5);
 
-        $node0->setNodeRelative($node1);
         $node0->setNodeRelative($node2);
         $node1->setNodeRelative($node2);
         $node1->setNodeRelative($node3);