add readonly to properties

Author: dominikzogg

src/Decoder/XmlTypeDecoder.php

@@ -6,7 +6,7 @@
 
 final class XmlTypeDecoder implements TypeDecoderInterface
 {
-    private JsonxTypeDecoder $jsonxTypeDecoder;
+    private readonly JsonxTypeDecoder $jsonxTypeDecoder;
 
     public function __construct()
     {

src/Encoder/JsonTypeEncoder.php

@@ -6,7 +6,7 @@
 
 final class JsonTypeEncoder implements TypeEncoderInterface
 {
-    public function __construct(private bool $prettyPrint = false) {}
+    public function __construct(private readonly bool $prettyPrint = false) {}
 
     public function getContentType(): string
     {

src/Encoder/JsonxTypeEncoder.php

@@ -16,7 +16,7 @@ final class JsonxTypeEncoder implements TypeEncoderInterface
     public const string DATATYPE_NUMBER = 'number';
     public const string DATATYPE_NULL = 'null';
 
-    public function __construct(private bool $prettyPrint = false) {}
+    public function __construct(private readonly bool $prettyPrint = false) {}
 
     public function getContentType(): string
     {

src/Encoder/XmlTypeEncoder.php

@@ -6,7 +6,7 @@
 
 final class XmlTypeEncoder implements TypeEncoderInterface
 {
-    private JsonxTypeEncoder $jsonxTypeEncoder;
+    private readonly JsonxTypeEncoder $jsonxTypeEncoder;
 
     public function __construct(bool $prettyPrint = false)
     {