diff --git a/src/Extension/CoreExtension.php b/src/Extension/CoreExtension.php
index e6a72560c..8f45bfc38 100644
--- a/src/Extension/CoreExtension.php
+++ b/src/Extension/CoreExtension.php
@@ -185,50 +185,50 @@ final class CoreExtension extends AbstractExtension
     {
         return [
             // formatting filters
-            new TwigFilter('date', [self::class, 'dateFormatFilter'], ['needs_environment' => true]),
-            new TwigFilter('date_modify', [self::class, 'dateModifyFilter'], ['needs_environment' => true]),
+            new TwigFilter('date', [self::class, 'formatDate'], ['needs_environment' => true]),
+            new TwigFilter('date_modify', [self::class, 'modifyDate'], ['needs_environment' => true]),
             new TwigFilter('format', [self::class, 'sprintf']),
-            new TwigFilter('replace', [self::class, 'replaceFilter']),
-            new TwigFilter('number_format', [self::class, 'numberFormatFilter'], ['needs_environment' => true]),
+            new TwigFilter('replace', [self::class, 'replace']),
+            new TwigFilter('number_format', [self::class, 'formatNumber'], ['needs_environment' => true]),
             new TwigFilter('abs', 'abs'),
             new TwigFilter('round', [self::class, 'round']),
 
             // encoding
-            new TwigFilter('url_encode', [self::class, 'urlencodeFilter']),
+            new TwigFilter('url_encode', [self::class, 'urlencode']),
             new TwigFilter('json_encode', 'json_encode'),
             new TwigFilter('convert_encoding', [self::class, 'convertEncoding']),
 
             // string filters
-            new TwigFilter('title', [self::class, 'titleStringFilter'], ['needs_environment' => true]),
-            new TwigFilter('capitalize', [self::class, 'capitalizeStringFilter'], ['needs_environment' => true]),
-            new TwigFilter('upper', [self::class, 'upperFilter'], ['needs_environment' => true]),
-            new TwigFilter('lower', [self::class, 'lowerFilter'], ['needs_environment' => true]),
+            new TwigFilter('title', [self::class, 'titleCase'], ['needs_environment' => true]),
+            new TwigFilter('capitalize', [self::class, 'capitalize'], ['needs_environment' => true]),
+            new TwigFilter('upper', [self::class, 'upper'], ['needs_environment' => true]),
+            new TwigFilter('lower', [self::class, 'lower'], ['needs_environment' => true]),
             new TwigFilter('striptags', [self::class, 'striptags']),
-            new TwigFilter('trim', [self::class, 'trimFilter']),
+            new TwigFilter('trim', [self::class, 'trim']),
             new TwigFilter('nl2br', [self::class, 'nl2br'], ['pre_escape' => 'html', 'is_safe' => ['html']]),
             new TwigFilter('spaceless', [self::class, 'spaceless'], ['is_safe' => ['html']]),
 
             // array helpers
-            new TwigFilter('join', [self::class, 'joinFilter']),
-            new TwigFilter('split', [self::class, 'splitFilter'], ['needs_environment' => true]),
-            new TwigFilter('sort', [self::class, 'sortFilter'], ['needs_environment' => true]),
-            new TwigFilter('merge', [self::class, 'arrayMerge']),
-            new TwigFilter('batch', [self::class, 'arrayBatch']),
-            new TwigFilter('column', [self::class, 'arrayColumn']),
-            new TwigFilter('filter', [self::class, 'arrayFilter'], ['needs_environment' => true]),
-            new TwigFilter('map', [self::class, 'arrayMap'], ['needs_environment' => true]),
-            new TwigFilter('reduce', [self::class, 'arrayReduce'], ['needs_environment' => true]),
+            new TwigFilter('join', [self::class, 'join']),
+            new TwigFilter('split', [self::class, 'split'], ['needs_environment' => true]),
+            new TwigFilter('sort', [self::class, 'sort'], ['needs_environment' => true]),
+            new TwigFilter('merge', [self::class, 'merge']),
+            new TwigFilter('batch', [self::class, 'batch']),
+            new TwigFilter('column', [self::class, 'column']),
+            new TwigFilter('filter', [self::class, 'filter'], ['needs_environment' => true]),
+            new TwigFilter('map', [self::class, 'map'], ['needs_environment' => true]),
+            new TwigFilter('reduce', [self::class, 'reduce'], ['needs_environment' => true]),
 
             // string/array filters
-            new TwigFilter('reverse', [self::class, 'reverseFilter'], ['needs_environment' => true]),
-            new TwigFilter('length', [self::class, 'lengthFilter'], ['needs_environment' => true]),
+            new TwigFilter('reverse', [self::class, 'reverse'], ['needs_environment' => true]),
+            new TwigFilter('length', [self::class, 'length'], ['needs_environment' => true]),
             new TwigFilter('slice', [self::class, 'slice'], ['needs_environment' => true]),
             new TwigFilter('first', [self::class, 'first'], ['needs_environment' => true]),
             new TwigFilter('last', [self::class, 'last'], ['needs_environment' => true]),
 
             // iteration and runtime
-            new TwigFilter('default', [self::class, 'defaultFilter'], ['node_class' => DefaultFilter::class]),
-            new TwigFilter('keys', [self::class, 'getArrayKeysFilter']),
+            new TwigFilter('default', [self::class, 'default'], ['node_class' => DefaultFilter::class]),
+            new TwigFilter('keys', [self::class, 'keys']),
         ];
     }
 
@@ -241,7 +241,7 @@ final class CoreExtension extends AbstractExtension
             new TwigFunction('constant', [self::class, 'constant']),
             new TwigFunction('cycle', [self::class, 'cycle']),
             new TwigFunction('random', [self::class, 'random'], ['needs_environment' => true]),
-            new TwigFunction('date', [self::class, 'dateConverter'], ['needs_environment' => true]),
+            new TwigFunction('date', [self::class, 'convertDate'], ['needs_environment' => true]),
             new TwigFunction('include', [self::class, 'include'], ['needs_environment' => true, 'needs_context' => true, 'is_safe' => ['all']]),
             new TwigFunction('source', [self::class, 'source'], ['needs_environment' => true, 'is_safe' => ['all']]),
         ];
@@ -322,7 +322,7 @@ final class CoreExtension extends AbstractExtension
      *
      * @internal
      */
-    public static function cycle($values, $position)
+    public static function cycle($values, $position): string
     {
         if (!\is_array($values) && !$values instanceof \ArrayAccess) {
             return $values;
@@ -408,7 +408,7 @@ final class CoreExtension extends AbstractExtension
     }
 
     /**
-     * Converts a date to the given format.
+     * Formats a date.
      *
      *   {{ post.published_at|date("m/d/Y") }}
      *
@@ -416,11 +416,9 @@ final class CoreExtension extends AbstractExtension
      * @param string|null                             $format   The target format, null to use the default
      * @param \DateTimeZone|string|false|null         $timezone The target timezone, null to use the default, false to leave unchanged
      *
-     * @return string The formatted date
-     *
      * @internal
      */
-    public static function dateFormatFilter(Environment $env, $date, $format = null, $timezone = null)
+    public static function formatDate(Environment $env, $date, $format = null, $timezone = null): string
     {
         if (null === $format) {
             $formats = $env->getExtension(self::class)->getDateFormat();
@@ -431,7 +429,7 @@ final class CoreExtension extends AbstractExtension
             return $date->format($format);
         }
 
-        return self::dateConverter($env, $date, $timezone)->format($format);
+        return self::convertDate($env, $date, $timezone)->format($format);
     }
 
     /**
@@ -442,15 +440,13 @@ final class CoreExtension extends AbstractExtension
      * @param \DateTimeInterface|string $date     A date
      * @param string                    $modifier A modifier string
      *
-     * @return \DateTimeInterface
+     * @return \DateTime|\DateTimeImmutable
      *
      * @internal
      */
-    public static function dateModifyFilter(Environment $env, $date, $modifier)
+    public static function modifyDate(Environment $env, $date, $modifier)
     {
-        $date = self::dateConverter($env, $date, false);
-
-        return $date->modify($modifier);
+        return self::convertDate($env, $date, false)->modify($modifier);
     }
 
     /**
@@ -459,11 +455,9 @@ final class CoreExtension extends AbstractExtension
      * @param string|null $format
      * @param ...$values
      *
-     * @return string
-     *
      * @internal
      */
-    public static function sprintf($format, ...$values)
+    public static function sprintf($format, ...$values): string
     {
         return sprintf($format ?? '', ...$values);
     }
@@ -482,7 +476,7 @@ final class CoreExtension extends AbstractExtension
      *
      * @internal
      */
-    public static function dateConverter(Environment $env, $date = null, $timezone = null)
+    public static function convertDate(Environment $env, $date = null, $timezone = null)
     {
         // determine the timezone
         if (false !== $timezone) {
@@ -535,11 +529,9 @@ final class CoreExtension extends AbstractExtension
      * @param string|null        $str  String to replace in
      * @param array|\Traversable $from Replace values
      *
-     * @return string
-     *
      * @internal
      */
-    public static function replaceFilter($str, $from)
+    public static function replace($str, $from): string
     {
         if (!is_iterable($from)) {
             throw new RuntimeError(sprintf('The "replace" filter expects an array or "Traversable" as replace values, got "%s".', \is_object($from) ? \get_class($from) : \gettype($from)));
@@ -586,11 +578,9 @@ final class CoreExtension extends AbstractExtension
      * @param string|null $decimalPoint the character(s) to use for the decimal point
      * @param string|null $thousandSep  the character(s) to use for the thousands separator
      *
-     * @return string The formatted number
-     *
      * @internal
      */
-    public static function numberFormatFilter(Environment $env, $number, $decimal = null, $decimalPoint = null, $thousandSep = null)
+    public static function formatNumber(Environment $env, $number, $decimal = null, $decimalPoint = null, $thousandSep = null): string
     {
         $defaults = $env->getExtension(self::class)->getNumberFormat();
         if (null === $decimal) {
@@ -613,11 +603,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|array|null $url A URL or an array of query parameters
      *
-     * @return string The URL encoded value
-     *
      * @internal
      */
-    public static function urlencodeFilter($url)
+    public static function urlencode($url): string
     {
         if (\is_array($url)) {
             return http_build_query($url, '', '&', \PHP_QUERY_RFC3986);
@@ -637,11 +625,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param array|\Traversable ...$arrays Any number of arrays or Traversable objects to merge
      *
-     * @return array The merged array
-     *
      * @internal
      */
-    public static function arrayMerge(...$arrays)
+    public static function merge(...$arrays): array
     {
         $result = [];
 
@@ -743,11 +729,9 @@ final class CoreExtension extends AbstractExtension
      * @param string      $glue  The separator
      * @param string|null $and   The separator for the last pair
      *
-     * @return string The concatenated string
-     *
      * @internal
      */
-    public static function joinFilter($value, $glue = '', $and = null)
+    public static function join($value, $glue = '', $and = null): string
     {
         if (!is_iterable($value)) {
             $value = (array) $value;
@@ -789,11 +773,9 @@ final class CoreExtension extends AbstractExtension
      * @param string      $delimiter The delimiter
      * @param int|null    $limit     The limit
      *
-     * @return array The split string as an array
-     *
      * @internal
      */
-    public static function splitFilter(Environment $env, $value, $delimiter, $limit = null)
+    public static function split(Environment $env, $value, $delimiter, $limit = null): array
     {
         $value = $value ?? '';
 
@@ -824,7 +806,7 @@ final class CoreExtension extends AbstractExtension
     /**
      * @internal
      */
-    public static function defaultFilter($value, $default = '')
+    public static function default($value, $default = '')
     {
         if (self::testEmpty($value)) {
             return $default;
@@ -842,13 +824,9 @@ final class CoreExtension extends AbstractExtension
      *      {# ... #}
      *  {% endfor %}
      *
-     * @param array $array An array
-     *
-     * @return array The keys
-     *
      * @internal
      */
-    public static function getArrayKeysFilter($array)
+    public static function keys($array): array
     {
         if ($array instanceof \Traversable) {
             while ($array instanceof \IteratorAggregate) {
@@ -890,7 +868,7 @@ final class CoreExtension extends AbstractExtension
      *
      * @internal
      */
-    public static function reverseFilter(Environment $env, $item, $preserveKeys = false)
+    public static function reverse(Environment $env, $item, $preserveKeys = false)
     {
         if ($item instanceof \Traversable) {
             return array_reverse(iterator_to_array($item), $preserveKeys);
@@ -924,11 +902,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param array|\Traversable $array
      *
-     * @return array
-     *
      * @internal
      */
-    public static function sortFilter(Environment $env, $array, $arrow = null)
+    public static function sort(Environment $env, $array, $arrow = null): array
     {
         if ($array instanceof \Traversable) {
             $array = iterator_to_array($array);
@@ -1057,13 +1033,11 @@ final class CoreExtension extends AbstractExtension
     }
 
     /**
-     * @return int
-     *
      * @throws RuntimeError When an invalid pattern is used
      *
      * @internal
      */
-    public static function matches(string $regexp, ?string $str)
+    public static function matches(string $regexp, ?string $str): int
     {
         set_error_handler(function ($t, $m) use ($regexp) {
             throw new RuntimeError(sprintf('Regexp "%s" passed to "matches" is not valid', $regexp).substr($m, 12));
@@ -1082,13 +1056,11 @@ final class CoreExtension extends AbstractExtension
      * @param string|null $characterMask
      * @param string      $side
      *
-     * @return string
-     *
      * @throws RuntimeError When an invalid trimming side is used (not a string or not 'left', 'right', or 'both')
      *
      * @internal
      */
-    public static function trimFilter($string, $characterMask = null, $side = 'both')
+    public static function trim($string, $characterMask = null, $side = 'both'): string
     {
         if (null === $characterMask) {
             $characterMask = " \t\n\r\0\x0B";
@@ -1111,11 +1083,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $string
      *
-     * @return string
-     *
      * @internal
      */
-    public static function nl2br($string)
+    public static function nl2br($string): string
     {
         return nl2br($string ?? '');
     }
@@ -1125,11 +1095,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $content
      *
-     * @return string
-     *
      * @internal
      */
-    public static function spaceless($content)
+    public static function spaceless($content): string
     {
         return trim(preg_replace('/>\s+</', '><', $content ?? ''));
     }
@@ -1139,11 +1107,9 @@ final class CoreExtension extends AbstractExtension
      * @param string      $to
      * @param string      $from
      *
-     * @return string
-     *
      * @internal
      */
-    public static function convertEncoding($string, $to, $from)
+    public static function convertEncoding($string, $to, $from): string
     {
         if (!\function_exists('iconv')) {
             throw new RuntimeError('Unable to convert encoding: required function iconv() does not exist. You should install ext-iconv or symfony/polyfill-iconv.');
@@ -1157,11 +1123,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param mixed $thing A variable
      *
-     * @return int The length of the value
-     *
      * @internal
      */
-    public static function lengthFilter(Environment $env, $thing)
+    public static function length(Environment $env, $thing): int
     {
         if (null === $thing) {
             return 0;
@@ -1191,11 +1155,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $string A string
      *
-     * @return string The uppercased string
-     *
      * @internal
      */
-    public static function upperFilter(Environment $env, $string)
+    public static function upper(Environment $env, $string): string
     {
         return mb_strtoupper($string ?? '', $env->getCharset());
     }
@@ -1205,11 +1167,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $string A string
      *
-     * @return string The lowercased string
-     *
      * @internal
      */
-    public static function lowerFilter(Environment $env, $string)
+    public static function lower(Environment $env, $string): string
     {
         return mb_strtolower($string ?? '', $env->getCharset());
     }
@@ -1220,11 +1180,9 @@ final class CoreExtension extends AbstractExtension
      * @param string|null          $string
      * @param string[]|string|null $allowable_tags
      *
-     * @return string
-     *
      * @internal
      */
-    public static function striptags($string, $allowable_tags = null)
+    public static function striptags($string, $allowable_tags = null): string
     {
         return strip_tags($string ?? '', $allowable_tags);
     }
@@ -1234,11 +1192,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $string A string
      *
-     * @return string The titlecased string
-     *
      * @internal
      */
-    public static function titleStringFilter(Environment $env, $string)
+    public static function titleCase(Environment $env, $string): string
     {
         return mb_convert_case($string ?? '', \MB_CASE_TITLE, $env->getCharset());
     }
@@ -1248,11 +1204,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param string|null $string A string
      *
-     * @return string The capitalized string
-     *
      * @internal
      */
-    public static function capitalizeStringFilter(Environment $env, $string)
+    public static function capitalize(Environment $env, $string): string
     {
         $charset = $env->getCharset();
 
@@ -1316,11 +1270,9 @@ final class CoreExtension extends AbstractExtension
      *
      * @param mixed $value A variable
      *
-     * @return bool true if the value is empty, false otherwise
-     *
      * @internal
      */
-    public static function testEmpty($value)
+    public static function testEmpty($value): bool
     {
         if ($value instanceof \Countable) {
             return 0 === \count($value);
@@ -1337,27 +1289,6 @@ final class CoreExtension extends AbstractExtension
         return '' === $value || false === $value || null === $value || [] === $value;
     }
 
-    /**
-     * Checks if a variable is traversable.
-     *
-     *    {# evaluates to true if the foo variable is an array or a traversable object #}
-     *    {% if foo is iterable %}
-     *        {# ... #}
-     *    {% endif %}
-     *
-     * @param mixed $value A variable
-     *
-     * @return bool true if the value is traversable
-     *
-     * @deprecated since Twig 3.8, to be removed in 4.0 (use the native "is_iterable" function instead)
-     *
-     * @internal
-     */
-    public static function testIterable($value)
-    {
-        return is_iterable($value);
-    }
-
     /**
      * Renders a template.
      *
@@ -1368,11 +1299,9 @@ final class CoreExtension extends AbstractExtension
      * @param bool                         $ignoreMissing Whether to ignore missing templates or not
      * @param bool                         $sandboxed     Whether to sandbox the template or not
      *
-     * @return string The rendered template
-     *
      * @internal
      */
-    public static function include(Environment $env, $context, $template, $variables = [], $withContext = true, $ignoreMissing = false, $sandboxed = false)
+    public static function include(Environment $env, $context, $template, $variables = [], $withContext = true, $ignoreMissing = false, $sandboxed = false): string
     {
         $alreadySandboxed = false;
         $sandbox = null;
@@ -1418,11 +1347,9 @@ final class CoreExtension extends AbstractExtension
      * @param string $name          The template name
      * @param bool   $ignoreMissing Whether to ignore missing templates or not
      *
-     * @return string The template source
-     *
      * @internal
      */
-    public static function source(Environment $env, $name, $ignoreMissing = false)
+    public static function source(Environment $env, $name, $ignoreMissing = false): string
     {
         $loader = $env->getLoader();
         try {
@@ -1442,11 +1369,9 @@ final class CoreExtension extends AbstractExtension
      * @param string      $constant The name of the constant
      * @param object|null $object   The object to get the constant from
      *
-     * @return string
-     *
      * @internal
      */
-    public static function constant($constant, $object = null)
+    public static function constant($constant, $object = null): string
     {
         if (null !== $object) {
             if ('class' === $constant) {
@@ -1473,11 +1398,9 @@ final class CoreExtension extends AbstractExtension
      * @param string      $constant The name of the constant
      * @param object|null $object   The object to get the constant from
      *
-     * @return bool
-     *
      * @internal
      */
-    public static function constantIsDefined($constant, $object = null)
+    public static function constantIsDefined($constant, $object = null): bool
     {
         if (null !== $object) {
             if ('class' === $constant) {
@@ -1497,11 +1420,9 @@ final class CoreExtension extends AbstractExtension
      * @param int   $size  The size of the batch
      * @param mixed $fill  A value used to fill missing items
      *
-     * @return array
-     *
      * @internal
      */
-    public static function arrayBatch($items, $size, $fill = null, $preserveKeys = true)
+    public static function batch($items, $size, $fill = null, $preserveKeys = true): array
     {
         if (!is_iterable($items)) {
             throw new RuntimeError(sprintf('The "batch" filter expects an array or "Traversable", got "%s".', \is_object($items) ? \get_class($items) : \gettype($items)));
@@ -1736,7 +1657,7 @@ final class CoreExtension extends AbstractExtension
      *
      * @internal
      */
-    public static function arrayColumn($array, $name, $index = null): array
+    public static function column($array, $name, $index = null): array
     {
         if ($array instanceof \Traversable) {
             $array = iterator_to_array($array);
@@ -1750,7 +1671,7 @@ final class CoreExtension extends AbstractExtension
     /**
      * @internal
      */
-    public static function arrayFilter(Environment $env, $array, $arrow)
+    public static function filter(Environment $env, $array, $arrow)
     {
         if (!is_iterable($array)) {
             throw new RuntimeError(sprintf('The "filter" filter expects an array or "Traversable", got "%s".', \is_object($array) ? \get_class($array) : \gettype($array)));
@@ -1769,7 +1690,7 @@ final class CoreExtension extends AbstractExtension
     /**
      * @internal
      */
-    public static function arrayMap(Environment $env, $array, $arrow)
+    public static function map(Environment $env, $array, $arrow)
     {
         self::checkArrowInSandbox($env, $arrow, 'map', 'filter');
 
@@ -1784,7 +1705,7 @@ final class CoreExtension extends AbstractExtension
     /**
      * @internal
      */
-    public static function arrayReduce(Environment $env, $array, $arrow, $initial = null)
+    public static function reduce(Environment $env, $array, $arrow, $initial = null)
     {
         self::checkArrowInSandbox($env, $arrow, 'reduce', 'filter');
 
diff --git a/src/Node/Expression/ArrayExpression.php b/src/Node/Expression/ArrayExpression.php
index 39b02f54e..5f8b0f63f 100644
--- a/src/Node/Expression/ArrayExpression.php
+++ b/src/Node/Expression/ArrayExpression.php
@@ -70,7 +70,7 @@ class ArrayExpression extends AbstractExpression
         $needsArrayMergeSpread = \PHP_VERSION_ID < 80100 && $this->hasSpreadItem($keyValuePairs);
 
         if ($needsArrayMergeSpread) {
-            $compiler->raw('CoreExtension::arrayMerge(');
+            $compiler->raw('CoreExtension::merge(');
         }
         $compiler->raw('[');
         $first = true;
diff --git a/src/Node/IncludeNode.php b/src/Node/IncludeNode.php
index abc0f3546..f10779a80 100644
--- a/src/Node/IncludeNode.php
+++ b/src/Node/IncludeNode.php
@@ -97,7 +97,7 @@ class IncludeNode extends Node implements NodeOutputInterface
             $compiler->raw(false === $this->getAttribute('only') ? '$context' : '[]');
         } elseif (false === $this->getAttribute('only')) {
             $compiler
-                ->raw('CoreExtension::arrayMerge($context, ')
+                ->raw('CoreExtension::merge($context, ')
                 ->subcompile($this->getNode('variables'))
                 ->raw(')')
             ;
diff --git a/src/Resources/core.php b/src/Resources/core.php
index eb08cafcd..fc73d325b 100644
--- a/src/Resources/core.php
+++ b/src/Resources/core.php
@@ -42,7 +42,7 @@ function twig_date_format_filter(Environment $env, $date, $format = null, $timez
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::dateFormatFilter($env, $date, $format, $timezone);
+    return CoreExtension::formatDate($env, $date, $format, $timezone);
 }
 
 /**
@@ -53,7 +53,7 @@ function twig_date_modify_filter(Environment $env, $date, $modifier)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::dateModifyFilter($env, $date, $modifier);
+    return CoreExtension::modifyDate($env, $date, $modifier);
 }
 
 /**
@@ -75,7 +75,7 @@ function twig_date_converter(Environment $env, $date = null, $timezone = null)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::dateConverter($env, $date, $timezone);
+    return CoreExtension::convertDate($env, $date, $timezone);
 }
 
 /**
@@ -86,7 +86,7 @@ function twig_replace_filter($str, $from)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::replaceFilter($str, $from);
+    return CoreExtension::replace($str, $from);
 }
 
 /**
@@ -108,7 +108,7 @@ function twig_number_format_filter(Environment $env, $number, $decimal = null, $
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::numberFormatFilter($env, $number, $decimal, $decimalPoint, $thousandSep);
+    return CoreExtension::formatNumber($env, $number, $decimal, $decimalPoint, $thousandSep);
 }
 
 /**
@@ -119,7 +119,7 @@ function twig_urlencode_filter($url)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::urlencodeFilter($url);
+    return CoreExtension::urlencode($url);
 }
 
 /**
@@ -130,7 +130,7 @@ function twig_array_merge(...$arrays)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayMerge(...$arrays);
+    return CoreExtension::merge(...$arrays);
 }
 
 /**
@@ -174,7 +174,7 @@ function twig_join_filter($value, $glue = '', $and = null)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::joinFilter($value, $glue, $and);
+    return CoreExtension::join($value, $glue, $and);
 }
 
 /**
@@ -185,7 +185,7 @@ function twig_split_filter(Environment $env, $value, $delimiter, $limit = null)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::splitFilter($env, $value, $delimiter, $limit);
+    return CoreExtension::split($env, $value, $delimiter, $limit);
 }
 
 /**
@@ -196,7 +196,7 @@ function twig_get_array_keys_filter($array)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::getArrayKeysFilter($array);
+    return CoreExtension::keys($array);
 }
 
 /**
@@ -207,7 +207,7 @@ function twig_reverse_filter(Environment $env, $item, $preserveKeys = false)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::reverseFilter($env, $item, $preserveKeys);
+    return CoreExtension::reverse($env, $item, $preserveKeys);
 }
 
 /**
@@ -218,7 +218,7 @@ function twig_sort_filter(Environment $env, $array, $arrow = null)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::sortFilter($env, $array, $arrow);
+    return CoreExtension::sort($env, $array, $arrow);
 }
 
 /**
@@ -240,7 +240,7 @@ function twig_trim_filter($string, $characterMask = null, $side = 'both')
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::trimFilter($string, $characterMask, $side);
+    return CoreExtension::trim($string, $characterMask, $side);
 }
 
 /**
@@ -284,7 +284,7 @@ function twig_length_filter(Environment $env, $thing)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::lengthFilter($env, $thing);
+    return CoreExtension::length($env, $thing);
 }
 
 /**
@@ -295,7 +295,7 @@ function twig_upper_filter(Environment $env, $string)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::upperFilter($env, $string);
+    return CoreExtension::upper($env, $string);
 }
 
 /**
@@ -306,7 +306,7 @@ function twig_lower_filter(Environment $env, $string)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::lowerFilter($env, $string);
+    return CoreExtension::lower($env, $string);
 }
 
 /**
@@ -328,7 +328,7 @@ function twig_title_string_filter(Environment $env, $string)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::titleStringFilter($env, $string);
+    return CoreExtension::titleCase($env, $string);
 }
 
 /**
@@ -339,7 +339,7 @@ function twig_capitalize_string_filter(Environment $env, $string)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::capitalizeStringFilter($env, $string);
+    return CoreExtension::capitalize($env, $string);
 }
 
 /**
@@ -416,7 +416,7 @@ function twig_array_batch($items, $size, $fill = null, $preserveKeys = true)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayBatch($items, $size, $fill, $preserveKeys);
+    return CoreExtension::batch($items, $size, $fill, $preserveKeys);
 }
 
 /**
@@ -427,7 +427,7 @@ function twig_array_column($array, $name, $index = null): array
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayColumn($array, $name, $index);
+    return CoreExtension::column($array, $name, $index);
 }
 
 /**
@@ -438,7 +438,7 @@ function twig_array_filter(Environment $env, $array, $arrow)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayFilter($env, $array, $arrow);
+    return CoreExtension::filter($env, $array, $arrow);
 }
 
 /**
@@ -449,7 +449,7 @@ function twig_array_map(Environment $env, $array, $arrow)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayMap($env, $array, $arrow);
+    return CoreExtension::map($env, $array, $arrow);
 }
 
 /**
@@ -460,7 +460,7 @@ function twig_array_reduce(Environment $env, $array, $arrow, $initial = null)
 {
     trigger_deprecation('twig/twig', '3.9', 'Using the internal "%s" function is deprecated.', __FUNCTION__);
 
-    return CoreExtension::arrayReduce($env, $array, $arrow, $initial);
+    return CoreExtension::reduce($env, $array, $arrow, $initial);
 }
 
 /**
diff --git a/tests/Extension/CoreTest.php b/tests/Extension/CoreTest.php
index e1971aeea..9fda22eac 100644
--- a/tests/Extension/CoreTest.php
+++ b/tests/Extension/CoreTest.php
@@ -123,7 +123,7 @@ class CoreTest extends TestCase
         $twig->setCharset('ISO-8859-1');
 
         $input = iconv('UTF-8', 'ISO-8859-1', 'Äé');
-        $output = iconv('ISO-8859-1', 'UTF-8', CoreExtension::reverseFilter($twig, $input));
+        $output = iconv('ISO-8859-1', 'UTF-8', CoreExtension::reverse($twig, $input));
 
         $this->assertEquals($output, 'éÄ');
     }
@@ -177,7 +177,7 @@ class CoreTest extends TestCase
      */
     public function testArrayKeysFilter(array $expected, $input)
     {
-        $this->assertSame($expected, CoreExtension::getArrayKeysFilter($input));
+        $this->assertSame($expected, CoreExtension::keys($input));
     }
 
     public function provideArrayKeyCases()
diff --git a/tests/Node/Expression/FilterTest.php b/tests/Node/Expression/FilterTest.php
index 18820cac8..352c9c94e 100644
--- a/tests/Node/Expression/FilterTest.php
+++ b/tests/Node/Expression/FilterTest.php
@@ -69,7 +69,7 @@ class FilterTest extends NodeTestCase
         $node = $this->createFilter($expr, 'upper');
         $node = $this->createFilter($node, 'number_format', [new ConstantExpression(2, 1), new ConstantExpression('.', 1), new ConstantExpression(',', 1)]);
 
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::numberFormatFilter($this->env, Twig\Extension\CoreExtension::upperFilter($this->env, "foo"), 2, ".", ",")'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::formatNumber($this->env, Twig\Extension\CoreExtension::upper($this->env, "foo"), 2, ".", ",")'];
 
         // named arguments
         $date = new ConstantExpression(0, 1);
@@ -77,25 +77,25 @@ class FilterTest extends NodeTestCase
             'timezone' => new ConstantExpression('America/Chicago', 1),
             'format' => new ConstantExpression('d/m/Y H:i:s P', 1),
         ]);
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::dateFormatFilter($this->env, 0, "d/m/Y H:i:s P", "America/Chicago")'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::formatDate($this->env, 0, "d/m/Y H:i:s P", "America/Chicago")'];
 
         // skip an optional argument
         $date = new ConstantExpression(0, 1);
         $node = $this->createFilter($date, 'date', [
             'timezone' => new ConstantExpression('America/Chicago', 1),
         ]);
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::dateFormatFilter($this->env, 0, null, "America/Chicago")'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::formatDate($this->env, 0, null, "America/Chicago")'];
 
         // underscores vs camelCase for named arguments
         $string = new ConstantExpression('abc', 1);
         $node = $this->createFilter($string, 'reverse', [
             'preserve_keys' => new ConstantExpression(true, 1),
         ]);
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::reverseFilter($this->env, "abc", true)'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::reverse($this->env, "abc", true)'];
         $node = $this->createFilter($string, 'reverse', [
             'preserveKeys' => new ConstantExpression(true, 1),
         ]);
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::reverseFilter($this->env, "abc", true)'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::reverse($this->env, "abc", true)'];
 
         // filter as an anonymous function
         $node = $this->createFilter(new ConstantExpression('foo', 1), 'anonymous');
diff --git a/tests/Node/Expression/FunctionTest.php b/tests/Node/Expression/FunctionTest.php
index 7fde21649..aeabfc3c6 100644
--- a/tests/Node/Expression/FunctionTest.php
+++ b/tests/Node/Expression/FunctionTest.php
@@ -76,7 +76,7 @@ class FunctionTest extends NodeTestCase
             'timezone' => new ConstantExpression('America/Chicago', 1),
             'date' => new ConstantExpression(0, 1),
         ]);
-        $tests[] = [$node, 'Twig\Extension\CoreExtension::dateConverter($this->env, 0, "America/Chicago")'];
+        $tests[] = [$node, 'Twig\Extension\CoreExtension::convertDate($this->env, 0, "America/Chicago")'];
 
         // arbitrary named arguments
         $node = $this->createFunction('barbar');
diff --git a/tests/Node/IncludeTest.php b/tests/Node/IncludeTest.php
index cda9d7bf2..55454f8d4 100644
--- a/tests/Node/IncludeTest.php
+++ b/tests/Node/IncludeTest.php
@@ -64,7 +64,7 @@ EOF
         $node = new IncludeNode($expr, $vars, false, false, 1);
         $tests[] = [$node, <<<'EOF'
 // line 1
-yield from $this->loadTemplate("foo.twig", null, 1)->unwrap()->yield(CoreExtension::arrayMerge($context, ["foo" => true]));
+yield from $this->loadTemplate("foo.twig", null, 1)->unwrap()->yield(CoreExtension::merge($context, ["foo" => true]));
 EOF
         ];