fix(openapi): nullable default values in operation openapi definition (#7321)

Co-authored-by: Martin Sršeň <martin@srsen.sk>

Author: soyuka

src/Metadata/Extractor/XmlResourceExtractor.php

@@ -224,12 +224,12 @@ private function buildOpenapi(\SimpleXMLElement $resource): bool|OpenApiOperatio
                     in: $this->phpize($parameter, 'in', 'string'),
                     description: $this->phpize($parameter, 'description', 'string'),
                     required: $this->phpize($parameter, 'required', 'bool'),
-                    deprecated: $this->phpize($parameter, 'deprecated', 'bool'),
-                    allowEmptyValue: $this->phpize($parameter, 'allowEmptyValue', 'bool'),
-                    schema: isset($parameter->schema->values) ? $this->buildValues($parameter->schema->values) : null,
+                    deprecated: $this->phpize($parameter, 'deprecated', 'bool', false),
+                    allowEmptyValue: $this->phpize($parameter, 'allowEmptyValue', 'bool', null),
+                    schema: isset($parameter->schema->values) ? $this->buildValues($parameter->schema->values) : [],
                     style: $this->phpize($parameter, 'style', 'string'),
-                    explode: $this->phpize($parameter, 'explode', 'bool'),
-                    allowReserved: $this->phpize($parameter, 'allowReserved', 'bool'),
+                    explode: $this->phpize($parameter, 'explode', 'bool', false),
+                    allowReserved: $this->phpize($parameter, 'allowReserved', 'bool', null),
                     example: $this->phpize($parameter, 'example', 'string'),
                     examples: isset($parameter->examples->values) ? new \ArrayObject($this->buildValues($parameter->examples->values)) : null,
                     content: isset($parameter->content->values) ? new \ArrayObject($this->buildValues($parameter->content->values)) : null,