diff --git a/src/Symfony/Component/String/AbstractString.php b/src/Symfony/Component/String/AbstractString.php
index d3d95d40a467..62a4f89200c6 100644
--- a/src/Symfony/Component/String/AbstractString.php
+++ b/src/Symfony/Component/String/AbstractString.php
@@ -95,12 +95,16 @@ public static function wrap(array $values): array
      *
      * @return static
      */
-    public function after($needle, bool $includeNeedle = false, int $offset = 0): self
+    public function after(string|iterable $needle, bool $includeNeedle = false, int $offset = 0): self
     {
         $str = clone $this;
         $i = \PHP_INT_MAX;
 
-        foreach ((array) $needle as $n) {
+        if (\is_string($needle)) {
+            $needle = [$needle];
+        }
+
+        foreach ($needle as $n) {
             $n = (string) $n;
             $j = $this->indexOf($n, $offset);
 
@@ -126,12 +130,16 @@ public function after($needle, bool $includeNeedle = false, int $offset = 0): se
      *
      * @return static
      */
-    public function afterLast($needle, bool $includeNeedle = false, int $offset = 0): self
+    public function afterLast(string|iterable $needle, bool $includeNeedle = false, int $offset = 0): self
     {
         $str = clone $this;
         $i = null;
 
-        foreach ((array) $needle as $n) {
+        if (\is_string($needle)) {
+            $needle = [$needle];
+        }
+
+        foreach ($needle as $n) {
             $n = (string) $n;
             $j = $this->indexOfLast($n, $offset);
 
@@ -162,12 +170,16 @@ abstract public function append(string ...$suffix): self;
      *
      * @return static
      */
-    public function before($needle, bool $includeNeedle = false, int $offset = 0): self
+    public function before(string|iterable $needle, bool $includeNeedle = false, int $offset = 0): self
     {
         $str = clone $this;
         $i = \PHP_INT_MAX;
 
-        foreach ((array) $needle as $n) {
+        if (\is_string($needle)) {
+            $needle = [$needle];
+        }
+
+        foreach ($needle as $n) {
             $n = (string) $n;
             $j = $this->indexOf($n, $offset);
 
@@ -193,12 +205,16 @@ public function before($needle, bool $includeNeedle = false, int $offset = 0): s
      *
      * @return static
      */
-    public function beforeLast($needle, bool $includeNeedle = false, int $offset = 0): self
+    public function beforeLast(string|iterable $needle, bool $includeNeedle = false, int $offset = 0): self
     {
         $str = clone $this;
         $i = null;
 
-        foreach ((array) $needle as $n) {
+        if (\is_string($needle)) {
+            $needle = [$needle];
+        }
+
+        foreach ($needle as $n) {
             $n = (string) $n;
             $j = $this->indexOfLast($n, $offset);
 
@@ -253,7 +269,7 @@ public function collapseWhitespace(): self
     /**
      * @param string|string[] $needle
      */
-    public function containsAny($needle): bool
+    public function containsAny(string|iterable $needle): bool
     {
         return null !== $this->indexOf($needle);
     }
@@ -261,9 +277,9 @@ public function containsAny($needle): bool
     /**
      * @param string|string[] $suffix
      */
-    public function endsWith($suffix): bool
+    public function endsWith(string|iterable $suffix): bool
     {
-        if (!\is_array($suffix) && !$suffix instanceof \Traversable) {
+        if (\is_string($suffix)) {
             throw new \TypeError(sprintf('Method "%s()" must be overridden by class "%s" to deal with non-iterable values.', __FUNCTION__, static::class));
         }
 
@@ -316,9 +332,9 @@ public function ensureStart(string $prefix): self
     /**
      * @param string|string[] $string
      */
-    public function equalsTo($string): bool
+    public function equalsTo(string|iterable $string): bool
     {
-        if (!\is_array($string) && !$string instanceof \Traversable) {
+        if (\is_string($string)) {
             throw new \TypeError(sprintf('Method "%s()" must be overridden by class "%s" to deal with non-iterable values.', __FUNCTION__, static::class));
         }
 
@@ -350,9 +366,9 @@ public function ignoreCase(): self
     /**
      * @param string|string[] $needle
      */
-    public function indexOf($needle, int $offset = 0): ?int
+    public function indexOf(string|iterable $needle, int $offset = 0): ?int
     {
-        if (!\is_array($needle) && !$needle instanceof \Traversable) {
+        if (\is_string($needle)) {
             throw new \TypeError(sprintf('Method "%s()" must be overridden by class "%s" to deal with non-iterable values.', __FUNCTION__, static::class));
         }
 
@@ -372,9 +388,9 @@ public function indexOf($needle, int $offset = 0): ?int
     /**
      * @param string|string[] $needle
      */
-    public function indexOfLast($needle, int $offset = 0): ?int
+    public function indexOfLast(string|iterable $needle, int $offset = 0): ?int
     {
-        if (!\is_array($needle) && !$needle instanceof \Traversable) {
+        if (\is_string($needle)) {
             throw new \TypeError(sprintf('Method "%s()" must be overridden by class "%s" to deal with non-iterable values.', __FUNCTION__, static::class));
         }
 
@@ -467,7 +483,7 @@ abstract public function replace(string $from, string $to): self;
      *
      * @return static
      */
-    abstract public function replaceMatches(string $fromRegexp, $to): self;
+    abstract public function replaceMatches(string $fromRegexp, string|callable $to): self;
 
     /**
      * @return static
@@ -540,9 +556,9 @@ public function split(string $delimiter, int $limit = null, int $flags = null):
     /**
      * @param string|string[] $prefix
      */
-    public function startsWith($prefix): bool
+    public function startsWith(string|iterable $prefix): bool
     {
-        if (!\is_array($prefix) && !$prefix instanceof \Traversable) {
+        if (\is_string($prefix)) {
             throw new \TypeError(sprintf('Method "%s()" must be overridden by class "%s" to deal with non-iterable values.', __FUNCTION__, static::class));
         }
 
diff --git a/src/Symfony/Component/String/AbstractUnicodeString.php b/src/Symfony/Component/String/AbstractUnicodeString.php
index 00e48984c6df..e24fa3c37dc4 100644
--- a/src/Symfony/Component/String/AbstractUnicodeString.php
+++ b/src/Symfony/Component/String/AbstractUnicodeString.php
@@ -303,7 +303,7 @@ public function padStart(int $length, string $padStr = ' '): parent
         return $this->pad($length, $pad, \STR_PAD_LEFT);
     }
 
-    public function replaceMatches(string $fromRegexp, $to): parent
+    public function replaceMatches(string $fromRegexp, string|callable $to): parent
     {
         if ($this->ignoreCase) {
             $fromRegexp .= 'i';
diff --git a/src/Symfony/Component/String/ByteString.php b/src/Symfony/Component/String/ByteString.php
index bbf8614cf7be..63183bd489b4 100644
--- a/src/Symfony/Component/String/ByteString.php
+++ b/src/Symfony/Component/String/ByteString.php
@@ -129,27 +129,23 @@ public function chunk(int $length = 1): array
         return $chunks;
     }
 
-    public function endsWith($suffix): bool
+    public function endsWith(string|iterable|AbstractString $suffix): bool
     {
-        if ($suffix instanceof parent) {
+        if ($suffix instanceof AbstractString) {
             $suffix = $suffix->string;
-        } elseif (\is_array($suffix) || $suffix instanceof \Traversable) {
+        } elseif (!\is_string($suffix)) {
             return parent::endsWith($suffix);
-        } else {
-            $suffix = (string) $suffix;
         }
 
         return '' !== $suffix && \strlen($this->string) >= \strlen($suffix) && 0 === substr_compare($this->string, $suffix, -\strlen($suffix), null, $this->ignoreCase);
     }
 
-    public function equalsTo($string): bool
+    public function equalsTo(string|iterable|AbstractString $string): bool
     {
-        if ($string instanceof parent) {
+        if ($string instanceof AbstractString) {
             $string = $string->string;
-        } elseif (\is_array($string) || $string instanceof \Traversable) {
+        } elseif (!\is_string($string)) {
             return parent::equalsTo($string);
-        } else {
-            $string = (string) $string;
         }
 
         if ('' !== $string && $this->ignoreCase) {
@@ -167,14 +163,12 @@ public function folded(): parent
         return $str;
     }
 
-    public function indexOf($needle, int $offset = 0): ?int
+    public function indexOf(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
-        if ($needle instanceof parent) {
+        if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOf($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         if ('' === $needle) {
@@ -186,14 +180,12 @@ public function indexOf($needle, int $offset = 0): ?int
         return false === $i ? null : $i;
     }
 
-    public function indexOfLast($needle, int $offset = 0): ?int
+    public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
-        if ($needle instanceof parent) {
+        if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOfLast($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         if ('' === $needle) {
@@ -305,7 +297,7 @@ public function replace(string $from, string $to): parent
         return $str;
     }
 
-    public function replaceMatches(string $fromRegexp, $to): parent
+    public function replaceMatches(string $fromRegexp, string|callable $to): parent
     {
         if ($this->ignoreCase) {
             $fromRegexp .= 'i';
@@ -404,9 +396,9 @@ public function split(string $delimiter, int $limit = null, int $flags = null):
         return $chunks;
     }
 
-    public function startsWith($prefix): bool
+    public function startsWith(string|iterable|AbstractString $prefix): bool
     {
-        if ($prefix instanceof parent) {
+        if ($prefix instanceof AbstractString) {
             $prefix = $prefix->string;
         } elseif (!\is_string($prefix)) {
             return parent::startsWith($prefix);
diff --git a/src/Symfony/Component/String/CodePointString.php b/src/Symfony/Component/String/CodePointString.php
index 8ab9209413b5..de52a821942c 100644
--- a/src/Symfony/Component/String/CodePointString.php
+++ b/src/Symfony/Component/String/CodePointString.php
@@ -80,14 +80,12 @@ public function codePointsAt(int $offset): array
         return '' === $str->string ? [] : [mb_ord($str->string, 'UTF-8')];
     }
 
-    public function endsWith($suffix): bool
+    public function endsWith(string|iterable|AbstractString $suffix): bool
     {
         if ($suffix instanceof AbstractString) {
             $suffix = $suffix->string;
-        } elseif (\is_array($suffix) || $suffix instanceof \Traversable) {
+        } elseif (!\is_string($suffix)) {
             return parent::endsWith($suffix);
-        } else {
-            $suffix = (string) $suffix;
         }
 
         if ('' === $suffix || !preg_match('//u', $suffix)) {
@@ -101,14 +99,12 @@ public function endsWith($suffix): bool
         return \strlen($this->string) >= \strlen($suffix) && 0 === substr_compare($this->string, $suffix, -\strlen($suffix));
     }
 
-    public function equalsTo($string): bool
+    public function equalsTo(string|iterable|AbstractString $string): bool
     {
         if ($string instanceof AbstractString) {
             $string = $string->string;
-        } elseif (\is_array($string) || $string instanceof \Traversable) {
+        } elseif (!\is_string($string)) {
             return parent::equalsTo($string);
-        } else {
-            $string = (string) $string;
         }
 
         if ('' !== $string && $this->ignoreCase) {
@@ -118,14 +114,12 @@ public function equalsTo($string): bool
         return $string === $this->string;
     }
 
-    public function indexOf($needle, int $offset = 0): ?int
+    public function indexOf(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
         if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOf($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         if ('' === $needle) {
@@ -137,14 +131,12 @@ public function indexOf($needle, int $offset = 0): ?int
         return false === $i ? null : $i;
     }
 
-    public function indexOfLast($needle, int $offset = 0): ?int
+    public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
         if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOfLast($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         if ('' === $needle) {
@@ -247,14 +239,12 @@ public function split(string $delimiter, int $limit = null, int $flags = null):
         return $chunks;
     }
 
-    public function startsWith($prefix): bool
+    public function startsWith(string|iterable|AbstractString $prefix): bool
     {
         if ($prefix instanceof AbstractString) {
             $prefix = $prefix->string;
-        } elseif (\is_array($prefix) || $prefix instanceof \Traversable) {
+        } elseif (!\is_string($prefix)) {
             return parent::startsWith($prefix);
-        } else {
-            $prefix = (string) $prefix;
         }
 
         if ('' === $prefix || !preg_match('//u', $prefix)) {
diff --git a/src/Symfony/Component/String/LazyString.php b/src/Symfony/Component/String/LazyString.php
index f2cca423f8ad..7f32c47c4572 100644
--- a/src/Symfony/Component/String/LazyString.php
+++ b/src/Symfony/Component/String/LazyString.php
@@ -25,10 +25,10 @@ class LazyString implements \Stringable, \JsonSerializable
      *
      * @return static
      */
-    public static function fromCallable($callback, ...$arguments): self
+    public static function fromCallable(callable|array $callback, mixed ...$arguments): self
     {
-        if (!\is_callable($callback) && !(\is_array($callback) && isset($callback[0]) && $callback[0] instanceof \Closure && 2 >= \count($callback))) {
-            throw new \TypeError(sprintf('Argument 1 passed to "%s()" must be a callable or a [Closure, method] lazy-callable, "%s" given.', __METHOD__, get_debug_type($callback)));
+        if (\is_array($callback) && !\is_callable($callback) && !(($callback[0] ?? null) instanceof \Closure || 2 < \count($callback))) {
+            throw new \TypeError(sprintf('Argument 1 passed to "%s()" must be a callable or a [Closure, method] lazy-callable, "%s" given.', __METHOD__, '['.implode(', ', array_map('get_debug_type', $callback)).']'));
         }
 
         $lazyString = new static();
@@ -50,16 +50,10 @@ public static function fromCallable($callback, ...$arguments): self
     }
 
     /**
-     * @param string|int|float|bool|\Stringable $value
-     *
      * @return static
      */
-    public static function fromStringable($value): self
+    public static function fromStringable(string|int|float|bool|\Stringable $value): self
     {
-        if (!self::isStringable($value)) {
-            throw new \TypeError(sprintf('Argument 1 passed to "%s()" must be a scalar or a stringable object, "%s" given.', __METHOD__, get_debug_type($value)));
-        }
-
         if (\is_object($value)) {
             return static::fromCallable([$value, '__toString']);
         }
@@ -73,19 +67,17 @@ public static function fromStringable($value): self
     /**
      * Tells whether the provided value can be cast to string.
      */
-    final public static function isStringable($value): bool
+    final public static function isStringable(mixed $value): bool
     {
-        return \is_string($value) || $value instanceof self || (\is_object($value) ? method_exists($value, '__toString') : is_scalar($value));
+        return \is_string($value) || $value instanceof \Stringable || is_scalar($value);
     }
 
     /**
      * Casts scalars and stringable objects to strings.
      *
-     * @param object|string|int|float|bool $value
-     *
      * @throws \TypeError When the provided value is not stringable
      */
-    final public static function resolve($value): string
+    final public static function resolve(\Stringable|string|int|float|bool $value): string
     {
         return $value;
     }
diff --git a/src/Symfony/Component/String/Slugger/AsciiSlugger.php b/src/Symfony/Component/String/Slugger/AsciiSlugger.php
index 5aecfeb5fcd7..a4bcd817184e 100644
--- a/src/Symfony/Component/String/Slugger/AsciiSlugger.php
+++ b/src/Symfony/Component/String/Slugger/AsciiSlugger.php
@@ -66,15 +66,8 @@ class AsciiSlugger implements SluggerInterface, LocaleAwareInterface
      */
     private $transliterators = [];
 
-    /**
-     * @param array|\Closure|null $symbolsMap
-     */
-    public function __construct(string $defaultLocale = null, $symbolsMap = null)
+    public function __construct(string $defaultLocale = null, array|\Closure|null $symbolsMap = null)
     {
-        if (null !== $symbolsMap && !\is_array($symbolsMap) && !$symbolsMap instanceof \Closure) {
-            throw new \TypeError(sprintf('Argument 2 passed to "%s()" must be array, Closure or null, "%s" given.', __METHOD__, \gettype($symbolsMap)));
-        }
-
         $this->defaultLocale = $defaultLocale;
         $this->symbolsMap = $symbolsMap ?? $this->symbolsMap;
     }
diff --git a/src/Symfony/Component/String/UnicodeString.php b/src/Symfony/Component/String/UnicodeString.php
index b3b5527d41a8..b3d4f50fd215 100644
--- a/src/Symfony/Component/String/UnicodeString.php
+++ b/src/Symfony/Component/String/UnicodeString.php
@@ -82,14 +82,12 @@ public function chunk(int $length = 1): array
         return $chunks;
     }
 
-    public function endsWith($suffix): bool
+    public function endsWith(string|iterable|AbstractString $suffix): bool
     {
         if ($suffix instanceof AbstractString) {
             $suffix = $suffix->string;
-        } elseif (\is_array($suffix) || $suffix instanceof \Traversable) {
+        } elseif (!\is_string($suffix)) {
             return parent::endsWith($suffix);
-        } else {
-            $suffix = (string) $suffix;
         }
 
         $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
@@ -106,14 +104,12 @@ public function endsWith($suffix): bool
         return $suffix === grapheme_extract($this->string, \strlen($suffix), \GRAPHEME_EXTR_MAXBYTES, \strlen($this->string) - \strlen($suffix));
     }
 
-    public function equalsTo($string): bool
+    public function equalsTo(string|iterable|AbstractString $string): bool
     {
         if ($string instanceof AbstractString) {
             $string = $string->string;
-        } elseif (\is_array($string) || $string instanceof \Traversable) {
+        } elseif (!\is_string($string)) {
             return parent::equalsTo($string);
-        } else {
-            $string = (string) $string;
         }
 
         $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
@@ -126,14 +122,12 @@ public function equalsTo($string): bool
         return $string === $this->string;
     }
 
-    public function indexOf($needle, int $offset = 0): ?int
+    public function indexOf(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
         if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOf($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
@@ -152,14 +146,12 @@ public function indexOf($needle, int $offset = 0): ?int
         return false === $i ? null : $i;
     }
 
-    public function indexOfLast($needle, int $offset = 0): ?int
+    public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0): ?int
     {
         if ($needle instanceof AbstractString) {
             $needle = $needle->string;
-        } elseif (\is_array($needle) || $needle instanceof \Traversable) {
+        } elseif (!\is_string($needle)) {
             return parent::indexOfLast($needle, $offset);
-        } else {
-            $needle = (string) $needle;
         }
 
         $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
@@ -256,7 +248,7 @@ public function replace(string $from, string $to): AbstractString
         return $str;
     }
 
-    public function replaceMatches(string $fromRegexp, $to): AbstractString
+    public function replaceMatches(string $fromRegexp, string|callable $to): AbstractString
     {
         $str = parent::replaceMatches($fromRegexp, $to);
         normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
@@ -327,14 +319,12 @@ public function split(string $delimiter, int $limit = null, int $flags = null):
         return $chunks;
     }
 
-    public function startsWith($prefix): bool
+    public function startsWith(string|iterable|AbstractString $prefix): bool
     {
         if ($prefix instanceof AbstractString) {
             $prefix = $prefix->string;
-        } elseif (\is_array($prefix) || $prefix instanceof \Traversable) {
+        } elseif (!\is_string($prefix)) {
             return parent::startsWith($prefix);
-        } else {
-            $prefix = (string) $prefix;
         }
 
         $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;