diff --git a/lib/Twig/Extension/Core.php b/lib/Twig/Extension/Core.php
index 0a05a0490..16959e4f4 100644
--- a/lib/Twig/Extension/Core.php
+++ b/lib/Twig/Extension/Core.php
@@ -296,8 +296,8 @@ function twig_cycle($values, $position)
  * - a random character from a string
  * - a random integer between 0 and the integer parameter.
  *
- * @param Twig_Environment             $env
- * @param Traversable|array|int|string $values The values to pick a random item from
+ * @param Twig_Environment                   $env
+ * @param Traversable|array|int|float|string $values The values to pick a random item from
  *
  * @throws Twig_Error_Runtime When $values is an empty array (does not apply to an empty string which is returned as is).
  *
@@ -991,7 +991,7 @@ function twig_escape_filter(Twig_Environment $env, $string, $strategy = 'html',
                 $string = twig_convert_encoding($string, 'UTF-8', $charset);
             }
 
-            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+            if (0 == strlen($string) ? false : 1 !== preg_match('/^./su', $string)) {
                 throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
             }
 
@@ -1008,7 +1008,7 @@ function twig_escape_filter(Twig_Environment $env, $string, $strategy = 'html',
                 $string = twig_convert_encoding($string, 'UTF-8', $charset);
             }
 
-            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+            if (0 == strlen($string) ? false : 1 !== preg_match('/^./su', $string)) {
                 throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
             }
 
@@ -1025,7 +1025,7 @@ function twig_escape_filter(Twig_Environment $env, $string, $strategy = 'html',
                 $string = twig_convert_encoding($string, 'UTF-8', $charset);
             }
 
-            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+            if (0 == strlen($string) ? false : 1 !== preg_match('/^./su', $string)) {
                 throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
             }
 
diff --git a/lib/Twig/Node/Expression/Array.php b/lib/Twig/Node/Expression/Array.php
index 77c95d5a1..aba1825c5 100644
--- a/lib/Twig/Node/Expression/Array.php
+++ b/lib/Twig/Node/Expression/Array.php
@@ -43,7 +43,7 @@ class Twig_Node_Expression_Array extends Twig_Node_Expression
         foreach ($this->getKeyValuePairs() as $pair) {
             // we compare the string representation of the keys
             // to avoid comparing the line numbers which are not relevant here.
-            if ((string) $key == (string) $pair['key']) {
+            if ((string) $key === (string) $pair['key']) {
                 return true;
             }
         }
diff --git a/lib/Twig/Node/Expression/Call.php b/lib/Twig/Node/Expression/Call.php
index 209d0c12e..a5c88c752 100644
--- a/lib/Twig/Node/Expression/Call.php
+++ b/lib/Twig/Node/Expression/Call.php
@@ -146,7 +146,7 @@ abstract class Twig_Node_Expression_Call extends Twig_Node_Expression
                     throw new Twig_Error_Syntax(sprintf('Argument "%s" is defined twice for %s "%s".', $name, $callType, $callName));
                 }
 
-                if (!empty($missingArguments)) {
+                if (count($missingArguments)) {
                     throw new Twig_Error_Syntax(sprintf(
                         'Argument "%s" could not be assigned for %s "%s(%s)" because it is mapped to an internal PHP function which cannot determine default value for optional argument%s "%s".',
                         $name, $callType, $callName, implode(', ', $names), count($missingArguments) > 1 ? 's' : '', implode('", "', $missingArguments))
@@ -218,7 +218,7 @@ abstract class Twig_Node_Expression_Call extends Twig_Node_Expression
 
     private function getCallableParameters($callable, $isVariadic)
     {
-        list($r, $_) = $this->reflectCallable($callable);
+        list($r) = $this->reflectCallable($callable);
         if (null === $r) {
             return array();
         }
diff --git a/lib/Twig/NodeVisitor/Optimizer.php b/lib/Twig/NodeVisitor/Optimizer.php
index 015f4b66e..c0411cb6e 100644
--- a/lib/Twig/NodeVisitor/Optimizer.php
+++ b/lib/Twig/NodeVisitor/Optimizer.php
@@ -133,13 +133,14 @@ class Twig_NodeVisitor_Optimizer extends Twig_BaseNodeVisitor
             return $node;
         }
 
+        $exprNode = $node->getNode('expr');
         if (
-            $node->getNode('expr') instanceof Twig_Node_Expression_BlockReference ||
-            $node->getNode('expr') instanceof Twig_Node_Expression_Parent
+            $exprNode instanceof Twig_Node_Expression_BlockReference ||
+            $exprNode instanceof Twig_Node_Expression_Parent
         ) {
-            $node->getNode('expr')->setAttribute('output', true);
+            $exprNode->setAttribute('output', true);
 
-            return $node->getNode('expr');
+            return $exprNode;
         }
 
         return $node;
diff --git a/lib/Twig/TemplateWrapper.php b/lib/Twig/TemplateWrapper.php
index 643a493d4..7325dcd3c 100644
--- a/lib/Twig/TemplateWrapper.php
+++ b/lib/Twig/TemplateWrapper.php
@@ -50,7 +50,7 @@ final class Twig_TemplateWrapper
      */
     public function display($context = array())
     {
-        return $this->template->display($context);
+        $this->template->display($context);
     }
 
     /**