null is not supported

Author: lvluoyue

src/Chain/JsonSchema/Factory.php

@@ -96,9 +96,9 @@ private function convertTypes(array $elements): ?array
             $type = $this->typeResolver->resolve($element);
             $schema = $this->getTypeSchema($type);
 
-            if ($type->isNullable() || ($element instanceof \ReflectionParameter && $element->isOptional())) {
+            if ($type->isNullable()) {
                 $schema['type'] = [$schema['type'], 'null'];
-            } else {
+            } elseif (!($element instanceof \ReflectionParameter && $element->isOptional())) {
                 $result['required'][] = $name;
             }
 

tests/Chain/Toolbox/ToolboxTest.php

@@ -96,7 +96,7 @@ public function toolsMap(): void
                                 'description' => 'The text given to the tool',
                             ],
                             'number' => [
-                                'type' => ['integer', 'null'],
+                                'type' => 'integer',
                                 'description' => 'A number given to the tool',
                             ],
                         ],
@@ -245,7 +245,7 @@ public function toolboxMapWithOverrideViaChain(): void
                                 'description' => 'The text given to the tool',
                             ],
                             'number' => [
-                                'type' => ['integer', 'null'],
+                                'type' => 'integer',
                                 'description' => 'A number given to the tool',
                             ],
                         ],