diff --git a/src/Extension/AbstractExtension.php b/src/Extension/AbstractExtension.php
index 422925f31..a1b083b68 100644
--- a/src/Extension/AbstractExtension.php
+++ b/src/Extension/AbstractExtension.php
@@ -40,6 +40,6 @@ abstract class AbstractExtension implements ExtensionInterface
 
     public function getOperators()
     {
-        return [];
+        return [[], []];
     }
 }
diff --git a/src/Extension/CoreExtension.php b/src/Extension/CoreExtension.php
index d0e1dccc7..7383a68a4 100644
--- a/src/Extension/CoreExtension.php
+++ b/src/Extension/CoreExtension.php
@@ -1516,7 +1516,7 @@ final class CoreExtension extends AbstractExtension
             throw new RuntimeError(\sprintf('The "batch" filter expects a sequence/mapping or "Traversable", got "%s".', \is_object($items) ? \get_class($items) : \gettype($items)));
         }
 
-        $size = ceil($size);
+        $size = (int) ceil($size);
 
         $result = array_chunk(self::toArray($items, $preserveKeys), $size, $preserveKeys);
 
diff --git a/src/Extension/EscaperExtension.php b/src/Extension/EscaperExtension.php
index b3ebf65fe..f453ada93 100644
--- a/src/Extension/EscaperExtension.php
+++ b/src/Extension/EscaperExtension.php
@@ -119,7 +119,7 @@ final class EscaperExtension extends AbstractExtension
      * Defines a new escaper to be used via the escape filter.
      *
      * @param string                                $strategy The strategy name that should be used as a strategy in the escape call
-     * @param callable(Environment, string, string) $callable A valid PHP callable
+     * @param callable(Environment, string, string): string $callable A valid PHP callable
      *
      * @deprecated since Twig 3.10
      */
@@ -142,7 +142,7 @@ final class EscaperExtension extends AbstractExtension
     /**
      * Gets all defined escapers.
      *
-     * @return array<callable(Environment, string, string)> An array of escapers
+     * @return array<string, callable(Environment, string, string): string> An array of escapers
      *
      * @deprecated since Twig 3.10
      */
diff --git a/src/Extension/ExtensionInterface.php b/src/Extension/ExtensionInterface.php
index ab9c2c37c..10a42b6b1 100644
--- a/src/Extension/ExtensionInterface.php
+++ b/src/Extension/ExtensionInterface.php
@@ -12,8 +12,7 @@
 namespace Twig\Extension;
 
 use Twig\ExpressionParser;
-use Twig\Node\Expression\Binary\AbstractBinary;
-use Twig\Node\Expression\Unary\AbstractUnary;
+use Twig\Node\Expression\AbstractExpression;
 use Twig\NodeVisitor\NodeVisitorInterface;
 use Twig\TokenParser\TokenParserInterface;
 use Twig\TwigFilter;
@@ -68,8 +67,8 @@ interface ExtensionInterface
      * @return array<array> First array of unary operators, second array of binary operators
      *
      * @psalm-return array{
-     *     array<string, array{precedence: int, class: class-string<AbstractUnary>}>,
-     *     array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}>
+     *     array<string, array{precedence: int, class: class-string<AbstractExpression>}>,
+     *     array<string, array{precedence: int, class?: class-string<AbstractExpression>, associativity: ExpressionParser::OPERATOR_*}>
      * }
      */
     public function getOperators();
diff --git a/src/ExtensionSet.php b/src/ExtensionSet.php
index 34b600063..8b59a13e1 100644
--- a/src/ExtensionSet.php
+++ b/src/ExtensionSet.php
@@ -15,6 +15,7 @@ use Twig\Error\RuntimeError;
 use Twig\Extension\ExtensionInterface;
 use Twig\Extension\GlobalsInterface;
 use Twig\Extension\StagingExtension;
+use Twig\Node\Expression\AbstractExpression;
 use Twig\Node\Expression\Binary\AbstractBinary;
 use Twig\Node\Expression\Unary\AbstractUnary;
 use Twig\NodeVisitor\NodeVisitorInterface;
@@ -39,9 +40,9 @@ final class ExtensionSet
     private $tests;
     /** @var array<string, TwigFunction> */
     private $functions;
-    /** @var array<string, array{precedence: int, class: class-string<AbstractUnary>}> */
+    /** @var array<string, array{precedence: int, class: class-string<AbstractExpression>}> */
     private $unaryOperators;
-    /** @var array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}> */
+    /** @var array<string, array{precedence: int, class?: class-string<AbstractExpression>, associativity: ExpressionParser::OPERATOR_*}> */
     private $binaryOperators;
     /** @var array<string, mixed> */
     private $globals;
@@ -391,7 +392,7 @@ final class ExtensionSet
     }
 
     /**
-     * @return array<string, array{precedence: int, class: class-string<AbstractUnary>}>
+     * @return array<string, array{precedence: int, class: class-string<AbstractExpression>}>
      */
     public function getUnaryOperators(): array
     {
@@ -403,7 +404,7 @@ final class ExtensionSet
     }
 
     /**
-     * @return array<string, array{precedence: int, class: class-string<AbstractBinary>, associativity: ExpressionParser::OPERATOR_*}>
+     * @return array<string, array{precedence: int, class?: class-string<AbstractExpression>, associativity: ExpressionParser::OPERATOR_*}>
      */
     public function getBinaryOperators(): array
     {
diff --git a/src/Node/Expression/CallExpression.php b/src/Node/Expression/CallExpression.php
index 997e8dc9f..cd81df47a 100644
--- a/src/Node/Expression/CallExpression.php
+++ b/src/Node/Expression/CallExpression.php
@@ -279,7 +279,7 @@ abstract class CallExpression extends AbstractExpression
         $isPhpVariadic = false;
         if ($isVariadic) {
             $argument = end($parameters);
-            $isArray = $argument && $argument->hasType() && 'array' === $argument->getType()->getName();
+            $isArray = $argument && $argument->hasType() && $argument->getType() instanceof \ReflectionNamedType && 'array' === $argument->getType()->getName();
             if ($isArray && $argument->isDefaultValueAvailable() && [] === $argument->getDefaultValue()) {
                 array_pop($parameters);
             } elseif ($argument && $argument->isVariadic()) {
diff --git a/src/Node/Expression/MethodCallExpression.php b/src/Node/Expression/MethodCallExpression.php
index 6fa1c3f9e..01806f91d 100644
--- a/src/Node/Expression/MethodCallExpression.php
+++ b/src/Node/Expression/MethodCallExpression.php
@@ -46,7 +46,9 @@ class MethodCallExpression extends AbstractExpression
             ->raw(', [')
         ;
         $first = true;
-        foreach ($this->getNode('arguments')->getKeyValuePairs() as $pair) {
+        /** @var ArrayExpression */
+        $args = $this->getNode('arguments');
+        foreach ($args->getKeyValuePairs() as $pair) {
             if (!$first) {
                 $compiler->raw(', ');
             }
diff --git a/src/Node/PrintNode.php b/src/Node/PrintNode.php
index bdc738301..da442d852 100644
--- a/src/Node/PrintNode.php
+++ b/src/Node/PrintNode.php
@@ -31,10 +31,13 @@ class PrintNode extends Node implements NodeOutputInterface
 
     public function compile(Compiler $compiler): void
     {
+        /** @var AbstractExpression */
+        $expr = $this->getNode('expr');
+
         $compiler
             ->addDebugInfo($this)
-            ->write($this->getNode('expr')->isGenerator() ? 'yield from ' : 'yield ')
-            ->subcompile($this->getNode('expr'))
+            ->write($expr->isGenerator() ? 'yield from ' : 'yield ')
+            ->subcompile($expr)
             ->raw(";\n")
         ;
     }
diff --git a/src/Runtime/EscaperRuntime.php b/src/Runtime/EscaperRuntime.php
index 433a0250c..4df834306 100644
--- a/src/Runtime/EscaperRuntime.php
+++ b/src/Runtime/EscaperRuntime.php
@@ -17,6 +17,7 @@ use Twig\Markup;
 
 final class EscaperRuntime implements RuntimeExtensionInterface
 {
+    /** @var array<string, callable(string $string, string $charset): string> */
     private $escapers = [];
 
     /** @internal */
@@ -36,7 +37,7 @@ final class EscaperRuntime implements RuntimeExtensionInterface
      * Defines a new escaper to be used via the escape filter.
      *
      * @param string                                    $strategy The strategy name that should be used as a strategy in the escape call
-     * @param callable(string $string, string $charset) $callable A valid PHP callable
+     * @param callable(string $string, string $charset): string $callable A valid PHP callable
      */
     public function setEscaper($strategy, callable $callable)
     {
@@ -46,7 +47,7 @@ final class EscaperRuntime implements RuntimeExtensionInterface
     /**
      * Gets all defined escapers.
      *
-     * @return array<callable(string $string, string $charset)> An array of escapers
+     * @return array<string, callable(string $string, string $charset): string> An array of escapers
      */
     public function getEscapers()
     {
diff --git a/src/Test/NodeTestCase.php b/src/Test/NodeTestCase.php
index e6a954948..4046f08cd 100644
--- a/src/Test/NodeTestCase.php
+++ b/src/Test/NodeTestCase.php
@@ -53,7 +53,11 @@ abstract class NodeTestCase extends TestCase
 
     protected function getEnvironment()
     {
-        return $this->currentEnv = new Environment(new ArrayLoader());
+        if (!$this->currentEnv) {
+            $this->currentEnv = new Environment(new ArrayLoader());
+        }
+
+        return $this->currentEnv;
     }
 
     protected function getVariableGetter($name, $line = false)
diff --git a/src/Util/DeprecationCollector.php b/src/Util/DeprecationCollector.php
index 378b666bd..ad5310617 100644
--- a/src/Util/DeprecationCollector.php
+++ b/src/Util/DeprecationCollector.php
@@ -60,6 +60,8 @@ final class DeprecationCollector
             if (\E_USER_DEPRECATED === $type) {
                 $deprecations[] = $msg;
             }
+
+            return false;
         });
 
         foreach ($iterator as $name => $contents) {