diff --git a/src/ArrayBuffer.php b/src/ArrayBuffer.php
index 91d2b53..3f70654 100644
--- a/src/ArrayBuffer.php
+++ b/src/ArrayBuffer.php
@@ -16,7 +16,7 @@ class ArrayBuffer extends Buffer
     /**
      * @var int<0, max>
      */
-    private int $size;
+    private readonly int $size;
 
     /**
      * @param iterable<int<0, max>, TokenInterface> $stream
@@ -45,7 +45,7 @@ private function iterableToArray(iterable $tokens): array
         return $tokens;
     }
 
-    public function seek($offset): void
+    public function seek(int $offset): void
     {
         if ($offset < $this->initial) {
             throw new \OutOfRangeException(
diff --git a/src/Buffer.php b/src/Buffer.php
index ece21f7..037ea21 100644
--- a/src/Buffer.php
+++ b/src/Buffer.php
@@ -51,7 +51,7 @@ public function rewind(): void
         $this->seek($this->initial);
     }
 
-    public function seek($offset): void
+    public function seek(int $offset): void
     {
         \assert($offset >= 0);
 
@@ -60,8 +60,6 @@ public function seek($offset): void
 
     /**
      * @param array<TokenInterface> $data
-     *
-     * @psalm-suppress PossiblyNullArrayOffset
      */
     protected function currentFrom(array $data): TokenInterface
     {
diff --git a/src/BufferInterface.php b/src/BufferInterface.php
index c69ebba..f0bf313 100644
--- a/src/BufferInterface.php
+++ b/src/BufferInterface.php
@@ -20,7 +20,7 @@ interface BufferInterface extends \SeekableIterator
      *
      * @param int<0, max> $offset
      */
-    public function seek($offset): void;
+    public function seek(int $offset): void;
 
     /**
      * Return the current token.
diff --git a/src/ExtrusiveBuffer.php b/src/ExtrusiveBuffer.php
index 5e96eab..303ed6a 100644
--- a/src/ExtrusiveBuffer.php
+++ b/src/ExtrusiveBuffer.php
@@ -20,23 +20,17 @@ class ExtrusiveBuffer extends LazyBuffer
      */
     public const BUFFER_DEFAULT_SIZE = 100;
 
-    /**
-     * @var int<1, max>
-     */
-    private int $size;
-
     /**
      * @param iterable<TokenInterface> $stream
-     * @param int<1, max> $size
      */
     public function __construct(
         iterable $stream,
-        int $size = self::BUFFER_DEFAULT_SIZE
+        /**
+         * @var int<1, max>
+         */
+        private readonly int $size = self::BUFFER_DEFAULT_SIZE,
     ) {
-        $this->size = $size;
-
-        /** @psalm-suppress RedundantCondition */
-        assert($this->size > 0, 'Buffer size must be greater than 0, but ' . $size . ' passed');
+        assert($this->size > 0, 'Buffer size must be greater than 0, but ' . $this->size . ' passed');
 
         parent::__construct($stream);
     }
@@ -49,7 +43,7 @@ public function getBufferSize(): int
         return $this->size;
     }
 
-    public function seek($offset): void
+    public function seek(int $offset): void
     {
         if ($offset < \array_key_first($this->buffer)) {
             $message = \sprintf(self::ERROR_BUFFER_MEMORY_ALREADY_FREED, $offset, $this->size);
@@ -63,7 +57,6 @@ public function seek($offset): void
     public function next(): void
     {
         if ($this->nextValid() && $this->getBufferCurrentSize() > $this->size) {
-            /** @psalm-suppress PossiblyNullArrayOffset */
             unset($this->buffer[\array_key_first($this->buffer)]);
         }
     }
diff --git a/src/LazyBuffer.php b/src/LazyBuffer.php
index 9c5ac3f..3cc4560 100644
--- a/src/LazyBuffer.php
+++ b/src/LazyBuffer.php
@@ -23,13 +23,10 @@ class LazyBuffer extends Buffer
      */
     public function __construct(iterable $stream)
     {
-        /** @psalm-suppress MixedPropertyTypeCoercion */
         $this->stream = $this->toGenerator($stream);
 
         if ($this->stream->valid()) {
-            /** @psalm-suppress MixedAssignment */
             $this->initial = $this->current = $this->stream->key();
-            /** @psalm-suppress MixedArrayOffset */
             $this->buffer[$this->current] = $this->stream->current();
 
             $this->stream->next();
@@ -54,7 +51,7 @@ public function getBufferCurrentSize(): int
         return \count($this->buffer);
     }
 
-    public function seek($offset): void
+    public function seek(int $offset): void
     {
         if ($offset < $this->initial) {
             throw new \OutOfRangeException(
@@ -102,7 +99,7 @@ protected function nextValid(): bool
         if (!isset($this->buffer[$this->current])) {
             $current = $this->stream->current();
 
-            if ($current) {
+            if ((bool) $current) {
                 $this->buffer[$this->current] = $current;
                 $this->stream->next();
 
@@ -113,9 +110,6 @@ protected function nextValid(): bool
         return false;
     }
 
-    /**
-     * @psalm-suppress MixedReturnTypeCoercion
-     */
     public function key(): int
     {
         if (!$this->valid()) {
diff --git a/src/MutableBuffer.php b/src/MutableBuffer.php
index 0de7d9f..82cf94d 100644
--- a/src/MutableBuffer.php
+++ b/src/MutableBuffer.php
@@ -10,17 +10,14 @@
  */
 class MutableBuffer implements BufferInterface
 {
-    private BufferInterface $parent;
-
     /**
      * @var array<int<0, max>, TokenInterface>
      */
     private array $overrides = [];
 
-    public function __construct(BufferInterface $parent)
-    {
-        $this->parent = $parent;
-    }
+    public function __construct(
+        private readonly BufferInterface $parent,
+    ) {}
 
     /**
      * @param int<0, max> $offset
@@ -54,7 +51,7 @@ private function poll(int $offset): TokenInterface
         }
     }
 
-    public function seek($offset): void
+    public function seek(int $offset): void
     {
         $this->parent->seek($offset);
     }