Add pjson support

tests/PjsonDocument.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+
+namespace Test;
+
+use Square\Pjson\{Json, JsonSerialize};
+
+/**
+ * A test document annotated with pjson attributes using the `JsonSerialize` trait
+ */
+class PjsonDocument
+{
+    use JsonSerialize;
+
+    public function __construct(#[Json] public PjsonId $id = new PjsonId(''), #[Json] public string $name = '',
+                                #[Json('num_value')] public int $numValue = 0, public string $skipped = 'yep') { }
+}