diff --git a/CHANGELOG b/CHANGELOG
index b86b9e5fc08..46134b232d5 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,20 @@
+# 3.6.0 (2023-05-03)
+
+ * Allow psr/container 2.0
+ * Add the new PHP 8.0 IntlDateFormatter::RELATIVE_* constants for date formatting
+ * Make the Lexer initialize itself lazily
+
+# 3.5.1 (2023-02-08)
+
+ * Arrow functions passed to the "reduce" filter now accept the current key as a third argument
+ * Restores the leniency of the matches twig comparison
+ * Fix error messages in sandboxed mode for "has some" and "has every"
+
 # 3.5.0 (2022-12-27)
 
- * Make Twig\ExpressionParser non internal
- * Add "some" and "every" filters
- * Add Compile::reset(
+ * Make Twig\ExpressionParser non-internal
+ * Add "has some" and "has every" operators
+ * Add Compile::reset()
  * Throw a better runtime error when the "matches" regexp is not valid
  * Add "twig *_names" intl functions
  * Fix optimizing closures callbacks
diff --git a/LICENSE b/LICENSE
index 8711927f6d9..fd8234e511b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009-2022 by the Twig Team.
+Copyright (c) 2009-present by the Twig Team.
 
 All rights reserved.
 
diff --git a/composer.json b/composer.json
index 18d3135bb4b..aeea64053ff 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^4.4.9|^5.0.9|^6.0",
-        "psr/container": "^1.0"
+        "psr/container": "^1.0|^2.0"
     },
     "autoload": {
         "psr-4" : {
@@ -41,10 +41,5 @@
         "psr-4" : {
             "Twig\\Tests\\" : "tests/"
         }
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/doc/filters/format_date.rst b/doc/filters/format_date.rst
index c4a900a4360..cd6beba9f5b 100644
--- a/doc/filters/format_date.rst
+++ b/doc/filters/format_date.rst
@@ -33,4 +33,4 @@ Arguments
 * ``dateFormat``: The date format
 * ``pattern``: A date time pattern
 * ``timezone``: The date timezone
-* ``calendar``: The calendar (Gregorian by default)
+* ``calendar``: The calendar ("gregorian" by default)
diff --git a/doc/filters/format_datetime.rst b/doc/filters/format_datetime.rst
index 9fed54f8ec9..8f3b46d479a 100644
--- a/doc/filters/format_datetime.rst
+++ b/doc/filters/format_datetime.rst
@@ -26,6 +26,12 @@ You can tweak the output for the date part and the time part:
 
 Supported values are: ``none``, ``short``, ``medium``, ``long``, and ``full``.
 
+.. versionadded:: 3.6
+
+    ``relative_short``, ``relative_medium``, ``relative_long``, and ``relative_full`` are also supported when running on
+    PHP 8.0 and superior or when using a polyfill that define the ``IntlDateFormatter::RELATIVE_*`` constants and
+    associated behavior.
+
 For greater flexibility, you can even define your own pattern
 (see the `ICU user guide`_ for supported patterns).
 
@@ -97,6 +103,6 @@ Arguments
 * ``timeFormat``: The time format
 * ``pattern``: A date time pattern
 * ``timezone``: The date timezone name
-* ``calendar``: The calendar (Gregorian by default)
+* ``calendar``: The calendar ("gregorian" by default)
 
 .. _ICU user guide: https://unicode-org.github.io/icu/userguide/format_parse/datetime/#datetime-format-syntax
diff --git a/doc/filters/format_time.rst b/doc/filters/format_time.rst
index 417b8a9c62b..1e213e6163b 100644
--- a/doc/filters/format_time.rst
+++ b/doc/filters/format_time.rst
@@ -33,4 +33,4 @@ Arguments
 * ``timeFormat``: The time format
 * ``pattern``: A date time pattern
 * ``timezone``: The date timezone
-* ``calendar``: The calendar (Gregorian by default)
+* ``calendar``: The calendar ("gregorian" by default)
diff --git a/doc/filters/length.rst b/doc/filters/length.rst
index d36712233cd..a9dfae423ca 100644
--- a/doc/filters/length.rst
+++ b/doc/filters/length.rst
@@ -12,8 +12,12 @@ it will return the length of the string provided by that method.
 
 For objects that implement the ``Traversable`` interface, ``length`` will use the return value of the ``iterator_count()`` method.
 
+For strings, `mb_strlen()`_ is used.
+
 .. code-block:: twig
 
     {% if users|length > 10 %}
         ...
     {% endif %}
+
+.. _mb_strlen(): https://www.php.net/manual/function.mb-strlen.php
diff --git a/doc/filters/reduce.rst b/doc/filters/reduce.rst
index 7df4646c745..72c68d0deb9 100644
--- a/doc/filters/reduce.rst
+++ b/doc/filters/reduce.rst
@@ -4,21 +4,21 @@
 The ``reduce`` filter iteratively reduces a sequence or a mapping to a single
 value using an arrow function, so as to reduce it to a single value. The arrow
 function receives the return value of the previous iteration and the current
-value of the sequence or mapping:
+value and key of the sequence or mapping:
 
 .. code-block:: twig
 
     {% set numbers = [1, 2, 3] %}
 
-    {{ numbers|reduce((carry, v) => carry + v) }}
-    {# output 6 #}
+    {{ numbers|reduce((carry, v, k) => carry + v * k) }}
+    {# output 8 #}
 
 The ``reduce`` filter takes an ``initial`` value as a second argument:
 
 .. code-block:: twig
 
-    {{ numbers|reduce((carry, v) => carry + v, 10) }}
-    {# output 16 #}
+    {{ numbers|reduce((carry, v, k) => carry + v * k, 10) }}
+    {# output 18 #}
 
 Note that the arrow function has access to the current context.
 
diff --git a/doc/filters/striptags.rst b/doc/filters/striptags.rst
index d5f542b3d8b..64a9c8156fe 100644
--- a/doc/filters/striptags.rst
+++ b/doc/filters/striptags.rst
@@ -1,7 +1,7 @@
 ``striptags``
 =============
 
-The ``striptags`` filter strips SGML/XML tags and replace adjacent whitespace
+The ``striptags`` filter strips SGML/XML tags and replaces adjacent whitespace characters
 by one space:
 
 .. code-block:: twig
diff --git a/doc/functions/index.rst b/doc/functions/index.rst
index 97465ed0395..eebcd61c7ab 100644
--- a/doc/functions/index.rst
+++ b/doc/functions/index.rst
@@ -19,4 +19,10 @@ Functions
     range
     source
     country_timezones
+    country_names
+    currency_names
+    language_names
+    locale_names
+    script_names
+    timezone_names
     template_from_string
diff --git a/doc/tags/if.rst b/doc/tags/if.rst
index 2d7475227c1..0523cb1ac19 100644
--- a/doc/tags/if.rst
+++ b/doc/tags/if.rst
@@ -26,8 +26,7 @@ You can also test if an array is not empty:
 
 .. note::
 
-    If you want to test if the variable is defined, use ``if users is
-    defined`` instead.
+    If you want to test if the variable is defined, use ``if users is defined`` instead.
 
 You can also use ``not`` to check for values that evaluate to ``false``:
 
diff --git a/doc/templates.rst b/doc/templates.rst
index 380d42b4f37..5e52326e442 100644
--- a/doc/templates.rst
+++ b/doc/templates.rst
@@ -505,7 +505,8 @@ Twig allows expressions everywhere.
     The operator precedence is as follows, with the lowest-precedence operators
     listed first: ``?:`` (ternary operator), ``b-and``, ``b-xor``, ``b-or``,
     ``or``, ``and``, ``==``, ``!=``, ``<=>``, ``<``, ``>``, ``>=``, ``<=``,
-    ``in``, ``matches``, ``starts with``, ``ends with``, ``..``, ``+``, ``-``,
+    ``in``, ``matches``, ``starts with``, ``ends with``, ``has every``, ``has
+    some``, ``..``, ``+``, ``-``,
     ``~``, ``*``, ``/``, ``//``, ``%``, ``is`` (tests), ``**``, ``??``, ``|``
     (filters), ``[]``, and ``.``:
 
@@ -661,6 +662,20 @@ next section).
         {% if phone matches '/^[\\d\\.]+$/' %}
         {% endif %}
 
+Check that a sequence or a mapping ``has every`` or ``has some`` of its
+elements return ``true`` using an arrow function. The arrow function receives
+the value of the sequence or mapping:
+
+.. code-block:: twig
+
+    {% set sizes = [34, 36, 38, 40, 42] %}
+
+    {% set hasOnlyOver38 = sizes has every v => v > 38 %}
+    {# hasOnlyOver38 is false #}
+
+    {% set hasOver38 = sizes has some v => v > 38 %}
+    {# hasOver38 is true #}
+
 Containment Operator
 ~~~~~~~~~~~~~~~~~~~~
 
diff --git a/extra/cache-extra/LICENSE b/extra/cache-extra/LICENSE
index efb17f98e7d..99c6bdf356e 100644
--- a/extra/cache-extra/LICENSE
+++ b/extra/cache-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2021 Fabien Potencier
+Copyright (c) 2021-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/cache-extra/composer.json b/extra/cache-extra/composer.json
index 05d75afd5f4..ec116d7d4ab 100644
--- a/extra/cache-extra/composer.json
+++ b/extra/cache-extra/composer.json
@@ -27,10 +27,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/cssinliner-extra/LICENSE b/extra/cssinliner-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/cssinliner-extra/LICENSE
+++ b/extra/cssinliner-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/cssinliner-extra/composer.json b/extra/cssinliner-extra/composer.json
index 1866f417ef9..a6799ed0dce 100644
--- a/extra/cssinliner-extra/composer.json
+++ b/extra/cssinliner-extra/composer.json
@@ -27,10 +27,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/html-extra/LICENSE b/extra/html-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/html-extra/LICENSE
+++ b/extra/html-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/html-extra/composer.json b/extra/html-extra/composer.json
index e5a545cf086..44f5a9faa46 100644
--- a/extra/html-extra/composer.json
+++ b/extra/html-extra/composer.json
@@ -27,10 +27,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/inky-extra/LICENSE b/extra/inky-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/inky-extra/LICENSE
+++ b/extra/inky-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/inky-extra/composer.json b/extra/inky-extra/composer.json
index 0a813c7bf2a..17e1be92c96 100644
--- a/extra/inky-extra/composer.json
+++ b/extra/inky-extra/composer.json
@@ -27,10 +27,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/intl-extra/IntlExtension.php b/extra/intl-extra/IntlExtension.php
index 76c2b271e71..955d6ec9233 100644
--- a/extra/intl-extra/IntlExtension.php
+++ b/extra/intl-extra/IntlExtension.php
@@ -26,7 +26,36 @@
 
 final class IntlExtension extends AbstractExtension
 {
-    private const DATE_FORMATS = [
+    private static function availableDateFormats(): array
+    {
+        static $formats = null;
+
+        if (null !== $formats) {
+            return $formats;
+        }
+
+        $formats = [
+            'none' => \IntlDateFormatter::NONE,
+            'short' => \IntlDateFormatter::SHORT,
+            'medium' => \IntlDateFormatter::MEDIUM,
+            'long' => \IntlDateFormatter::LONG,
+            'full' => \IntlDateFormatter::FULL,
+        ];
+
+        // Assuming that each `RELATIVE_*` constant are defined when one of them is.
+        if (\defined('IntlDateFormatter::RELATIVE_FULL')) {
+            $formats = array_merge($formats, [
+                'relative_short' => \IntlDateFormatter::RELATIVE_SHORT,
+                'relative_medium' => \IntlDateFormatter::RELATIVE_MEDIUM,
+                'relative_long' => \IntlDateFormatter::RELATIVE_LONG,
+                'relative_full' => \IntlDateFormatter::RELATIVE_FULL,
+            ]);
+        }
+
+        return $formats;
+    }
+
+    private const TIME_FORMATS = [
         'none' => \IntlDateFormatter::NONE,
         'short' => \IntlDateFormatter::SHORT,
         'medium' => \IntlDateFormatter::MEDIUM,
@@ -370,12 +399,14 @@ public function formatTime(Environment $env, $date, ?string $timeFormat = 'mediu
 
     private function createDateFormatter(?string $locale, ?string $dateFormat, ?string $timeFormat, string $pattern, \DateTimeZone $timezone, string $calendar): \IntlDateFormatter
     {
-        if (null !== $dateFormat && !isset(self::DATE_FORMATS[$dateFormat])) {
-            throw new RuntimeError(sprintf('The date format "%s" does not exist, known formats are: "%s".', $dateFormat, implode('", "', array_keys(self::DATE_FORMATS))));
+        $dateFormats = self::availableDateFormats();
+
+        if (null !== $dateFormat && !isset($dateFormats[$dateFormat])) {
+            throw new RuntimeError(sprintf('The date format "%s" does not exist, known formats are: "%s".', $dateFormat, implode('", "', array_keys($dateFormats))));
         }
 
-        if (null !== $timeFormat && !isset(self::DATE_FORMATS[$timeFormat])) {
-            throw new RuntimeError(sprintf('The time format "%s" does not exist, known formats are: "%s".', $timeFormat, implode('", "', array_keys(self::DATE_FORMATS))));
+        if (null !== $timeFormat && !isset(self::TIME_FORMATS[$timeFormat])) {
+            throw new RuntimeError(sprintf('The time format "%s" does not exist, known formats are: "%s".', $timeFormat, implode('", "', array_keys(self::TIME_FORMATS))));
         }
 
         if (null === $locale) {
@@ -384,8 +415,8 @@ private function createDateFormatter(?string $locale, ?string $dateFormat, ?stri
 
         $calendar = 'gregorian' === $calendar ? \IntlDateFormatter::GREGORIAN : \IntlDateFormatter::TRADITIONAL;
 
-        $dateFormatValue = self::DATE_FORMATS[$dateFormat] ?? null;
-        $timeFormatValue = self::DATE_FORMATS[$timeFormat] ?? null;
+        $dateFormatValue = $dateFormats[$dateFormat] ?? null;
+        $timeFormatValue = self::TIME_FORMATS[$timeFormat] ?? null;
 
         if ($this->dateFormatterPrototype) {
             $dateFormatValue = $dateFormatValue ?: $this->dateFormatterPrototype->getDateType();
diff --git a/extra/intl-extra/LICENSE b/extra/intl-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/intl-extra/LICENSE
+++ b/extra/intl-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/intl-extra/Tests/Fixtures/format_date_php8.test b/extra/intl-extra/Tests/Fixtures/format_date_php8.test
new file mode 100644
index 00000000000..67e0e6f4dbe
--- /dev/null
+++ b/extra/intl-extra/Tests/Fixtures/format_date_php8.test
@@ -0,0 +1,12 @@
+--TEST--
+"format_date" filter
+--CONDITION--
+PHP_VERSION_ID >= 80000
+--TEMPLATE--
+{{ 'today 23:39:12'|format_datetime('relative_short', 'none', locale='fr') }}
+{{ 'today 23:39:12'|format_datetime('relative_full', 'full', locale='fr') }}
+--DATA--
+return [];
+--EXPECT--
+aujourd’hui
+aujourd’hui à 23:39:12 temps universel coordonné
diff --git a/extra/intl-extra/composer.json b/extra/intl-extra/composer.json
index 24f3f0577e3..d357ad7254e 100644
--- a/extra/intl-extra/composer.json
+++ b/extra/intl-extra/composer.json
@@ -27,10 +27,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/markdown-extra/LICENSE b/extra/markdown-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/markdown-extra/LICENSE
+++ b/extra/markdown-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/markdown-extra/composer.json b/extra/markdown-extra/composer.json
index f26143525a8..20389ff9b24 100644
--- a/extra/markdown-extra/composer.json
+++ b/extra/markdown-extra/composer.json
@@ -30,10 +30,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/string-extra/LICENSE b/extra/string-extra/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/string-extra/LICENSE
+++ b/extra/string-extra/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/string-extra/composer.json b/extra/string-extra/composer.json
index 2b4a6950e6e..ed5d3ffa2f1 100644
--- a/extra/string-extra/composer.json
+++ b/extra/string-extra/composer.json
@@ -28,10 +28,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/extra/twig-extra-bundle/LICENSE b/extra/twig-extra-bundle/LICENSE
index 9c907a46a62..f37c76b591d 100644
--- a/extra/twig-extra-bundle/LICENSE
+++ b/extra/twig-extra-bundle/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2019-2022 Fabien Potencier
+Copyright (c) 2019-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/extra/twig-extra-bundle/TwigExtraBundle.php b/extra/twig-extra-bundle/TwigExtraBundle.php
index 5ed32a8ccca..a9c8f734bf8 100644
--- a/extra/twig-extra-bundle/TwigExtraBundle.php
+++ b/extra/twig-extra-bundle/TwigExtraBundle.php
@@ -17,6 +17,7 @@
 
 class TwigExtraBundle extends Bundle
 {
+    /** @return void */
     public function build(ContainerBuilder $container)
     {
         parent::build($container);
diff --git a/extra/twig-extra-bundle/composer.json b/extra/twig-extra-bundle/composer.json
index 3e183704493..b7f739bdf1f 100644
--- a/extra/twig-extra-bundle/composer.json
+++ b/extra/twig-extra-bundle/composer.json
@@ -36,10 +36,5 @@
         "exclude-from-classmap": [
             "/Tests/"
         ]
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.5-dev"
-        }
     }
 }
diff --git a/src/Environment.php b/src/Environment.php
index c4f2885849d..4b7d989bbef 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -40,10 +40,10 @@
  */
 class Environment
 {
-    public const VERSION = '3.5.0';
-    public const VERSION_ID = 30500;
+    public const VERSION = '3.6.0';
+    public const VERSION_ID = 30600;
     public const MAJOR_VERSION = 3;
-    public const MINOR_VERSION = 5;
+    public const MINOR_VERSION = 3;
     public const RELEASE_VERSION = 0;
     public const EXTRA_VERSION = '';
 
diff --git a/src/Extension/CoreExtension.php b/src/Extension/CoreExtension.php
index 65caab31fe1..f99adda451b 100644
--- a/src/Extension/CoreExtension.php
+++ b/src/Extension/CoreExtension.php
@@ -1021,19 +1021,19 @@ function twig_compare($a, $b)
 
 /**
  * @param string $pattern
- * @param string $subject
+ * @param string|null $subject
  *
  * @return int
  *
  * @throws RuntimeError When an invalid pattern is used
  */
-function twig_matches(string $regexp, string $str)
+function twig_matches(string $regexp, ?string $str)
 {
     set_error_handler(function ($t, $m) use ($regexp) {
         throw new RuntimeError(sprintf('Regexp "%s" passed to "matches" is not valid', $regexp).substr($m, 12));
     });
     try {
-        return preg_match($regexp, $str);
+        return preg_match($regexp, $str ?? '');
     } finally {
         restore_error_handler();
     }
@@ -1703,20 +1703,21 @@ function twig_array_reduce(Environment $env, $array, $arrow, $initial = null)
 {
     twig_check_arrow_in_sandbox($env, $arrow, 'reduce', 'filter');
 
-    if (!\is_array($array)) {
-        if (!$array instanceof \Traversable) {
-            throw new RuntimeError(sprintf('The "reduce" filter only works with arrays or "Traversable", got "%s" as first argument.', \gettype($array)));
-        }
+    if (!\is_array($array) && !$array instanceof \Traversable) {
+        throw new RuntimeError(sprintf('The "reduce" filter only works with arrays or "Traversable", got "%s" as first argument.', \gettype($array)));
+    }
 
-        $array = iterator_to_array($array);
+    $accumulator = $initial;
+    foreach ($array as $key => $value) {
+        $accumulator = $arrow($accumulator, $value, $key);
     }
 
-    return array_reduce($array, $arrow, $initial);
+    return $accumulator;
 }
 
 function twig_array_some(Environment $env, $array, $arrow)
 {
-    twig_check_arrow_in_sandbox($env, $arrow, 'some', 'filter');
+    twig_check_arrow_in_sandbox($env, $arrow, 'has some', 'operator');
 
     foreach ($array as $k => $v) {
         if ($arrow($v, $k)) {
@@ -1729,7 +1730,7 @@ function twig_array_some(Environment $env, $array, $arrow)
 
 function twig_array_every(Environment $env, $array, $arrow)
 {
-    twig_check_arrow_in_sandbox($env, $arrow, 'every', 'filter');
+    twig_check_arrow_in_sandbox($env, $arrow, 'has every', 'operator');
 
     foreach ($array as $k => $v) {
         if (!$arrow($v, $k)) {
diff --git a/src/Lexer.php b/src/Lexer.php
index 9ff028c87d9..975b0b924ff 100644
--- a/src/Lexer.php
+++ b/src/Lexer.php
@@ -19,6 +19,8 @@
  */
 class Lexer
 {
+    private $isInitialized = false;
+
     private $tokens;
     private $code;
     private $cursor;
@@ -61,6 +63,15 @@ public function __construct(Environment $env, array $options = [])
             'whitespace_line_chars' => ' \t\0\x0B',
             'interpolation' => ['#{', '}'],
         ], $options);
+    }
+
+    private function initialize()
+    {
+        if ($this->isInitialized) {
+            return;
+        }
+
+        $this->isInitialized = true;
 
         // when PHP 7.3 is the min version, we will be able to remove the '#' part in preg_quote as it's part of the default
         $this->regexes = [
@@ -153,6 +164,8 @@ public function __construct(Environment $env, array $options = [])
 
     public function tokenize(Source $source): TokenStream
     {
+        $this->initialize();
+
         $this->source = $source;
         $this->code = str_replace(["\r\n", "\r"], "\n", $source->getCode());
         $this->cursor = 0;
diff --git a/tests/Fixtures/expressions/matches.test b/tests/Fixtures/expressions/matches.test
index 95459c3b0f2..8f5e3669e61 100644
--- a/tests/Fixtures/expressions/matches.test
+++ b/tests/Fixtures/expressions/matches.test
@@ -4,9 +4,11 @@ Twig supports the "matches" operator
 {{ 'foo' matches '/o/' ? 'OK' : 'KO' }}
 {{ 'foo' matches '/^fo/' ? 'OK' : 'KO' }}
 {{ 'foo' matches '/O/i' ? 'OK' : 'KO' }}
+{{ null matches '/o/' }}
 --DATA--
 return []
 --EXPECT--
 OK
 OK
 OK
+0
diff --git a/tests/Fixtures/filters/reduce_key.test b/tests/Fixtures/filters/reduce_key.test
new file mode 100644
index 00000000000..fe1fb0a7ac5
--- /dev/null
+++ b/tests/Fixtures/filters/reduce_key.test
@@ -0,0 +1,14 @@
+--TEST--
+"reduce" filter passes iterable key to callback
+--TEMPLATE--
+{% set status_classes = {
+    'success': 200,
+    'warning': 400,
+    'error': 500,
+} %}
+
+{{ status_classes|reduce((carry, v, k) => status_code >= v ? k : carry, '') }}
+--DATA--
+return ['status_code' => 404]
+--EXPECT--
+warning