Set null type implicitly for nullable paramater definition

Author: pinepain

src/Specs/Builder/ParameterSpecBuilder.php

@@ -143,6 +143,11 @@ protected function buildOptionalParameterSpec(array $matches, ?string $default):
             }
         }
 
+        if ($this->hasNullable($matches)) {
+            // nullable means that null is a valid value and thus we should explicitly enable null extractor here
+            $matches['type'] = 'null|' . $matches['type'];
+        }
+
         return new OptionalParameterSpec($matches['name'], $this->extractor->build($matches['type']), $default);
     }
 

tests/Specs/Builder/ParameterSpecBuilderTest.php

@@ -199,7 +199,7 @@ public function testBuildingNullableParameterWithDefaultValueShouldThrowExceptio
 
     public function testBuildingNullableParameter()
     {
-        $this->extractorDefinitionShouldBuildOn('type');
+        $this->extractorDefinitionShouldBuildOn('null|type');
 
         $spec = $this->builder->build('param? : type');
 
@@ -255,7 +255,7 @@ public function testBuildingParameterWithBoolFalseTypeGuessing()
     public function testBuildingParameterWithNullableTypeGuessing()
     {
         $this->argumentDefinitionShouldBuildOn('null');
-        $this->extractorDefinitionShouldBuildOn('any');
+        $this->extractorDefinitionShouldBuildOn('null|any');
 
         $spec = $this->builder->build('param?');