Add ReturnTypeWillChange attribute

src/Api/DateTimeResult.php

@@ -4,6 +4,7 @@
 
 use Aws\Api\Parser\Exception\ParserException;
 use Exception;
+use \ReturnTypeWillChange;
 
 /**
  * DateTime overrides that make DateTime work more seamlessly as a string,
@@ -94,6 +95,7 @@ public function __toString()
      *
      * @return mixed|string
      */
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return (string) $this;

src/Crypto/MetadataEnvelope.php

@@ -6,6 +6,7 @@
 use \IteratorAggregate;
 use \InvalidArgumentException;
 use \JsonSerializable;
+use \ReturnTypeWillChange;
 
 /**
  * Stores encryption metadata for reading and writing.
@@ -49,6 +50,7 @@ public function offsetSet($name, $value)
         $this->data[$name] = $value;
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->data;

src/DynamoDb/BinaryValue.php

@@ -2,6 +2,7 @@
 namespace Aws\DynamoDb;
 
 use GuzzleHttp\Psr7;
+use \ReturnTypeWillChange;
 
 /**
  * Special object to represent a DynamoDB binary (B) value.
@@ -24,6 +25,7 @@ public function __construct($value)
         $this->value = (string) $value;
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->value;

src/DynamoDb/NumberValue.php

@@ -1,6 +1,8 @@
 <?php
 namespace Aws\DynamoDb;
 
+use \ReturnTypeWillChange;
+
 /**
  * Special object to represent a DynamoDB Number (N) value.
  */
@@ -17,6 +19,7 @@ public function __construct($value)
         $this->value = (string) $value;
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->value;

src/DynamoDb/SessionHandler.php

@@ -1,6 +1,8 @@
 <?php
 namespace Aws\DynamoDb;
 
+use \ReturnTypeWillChange;
+
 /**
  * Provides an interface for using Amazon DynamoDB as a session store by hooking
  * into PHP's session handler hooks. Once registered, You may use the native
@@ -101,6 +103,7 @@ public function register()
      *
      * @return bool Whether or not the operation succeeded.
      */
+     #[ReturnTypeWillChange]
     public function open($savePath, $sessionName)
     {
         $this->savePath = $savePath;
@@ -114,6 +117,7 @@ public function open($savePath, $sessionName)
      *
      * @return bool Success
      */
+     #[ReturnTypeWillChange]
     public function close()
     {
         $id = session_id();
@@ -134,6 +138,7 @@ public function close()
      *
      * @return string Session data.
      */
+     #[ReturnTypeWillChange]
     public function read($id)
     {
         $this->openSessionId = $id;
@@ -167,6 +172,7 @@ public function read($id)
      *
      * @return bool Whether or not the operation succeeded.
      */
+     #[ReturnTypeWillChange]
     public function write($id, $data)
     {
         $changed = $id !== $this->openSessionId
@@ -187,6 +193,7 @@ public function write($id, $data)
      *
      * @return bool Whether or not the operation succeeded.
      */
+     #[ReturnTypeWillChange]
     public function destroy($id)
     {
         $this->openSessionId = $id;
@@ -206,6 +213,7 @@ public function destroy($id)
      * @return bool Whether or not the operation succeeded.
      * @codeCoverageIgnore
      */
+     #[ReturnTypeWillChange]
     public function gc($maxLifetime)
     {
         // Garbage collection for a DynamoDB table must be triggered manually.

src/DynamoDb/SetValue.php

@@ -1,6 +1,8 @@
 <?php
 namespace Aws\DynamoDb;
 
+use \ReturnTypeWillChange;
+
 /**
  * Special object to represent a DynamoDB set (SS/NS/BS) value.
  */
@@ -37,6 +39,7 @@ public function getIterator()
         return new \ArrayIterator($this->values);
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->toArray();