Avoid array_merge inside loop in IntersectionType::getCallableParametersAcceptors()

Collect acceptor arrays and merge once outside the loop instead of
merging on each iteration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

src/Type/IntersectionType.php

@@ -1134,18 +1134,18 @@ public function getCallableParametersAcceptors(ClassMemberAccessAnswerer $scope)
 			}
 
 			if ($isCallable->yes()) {
-				$yesAcceptors = array_merge($yesAcceptors, $type->getCallableParametersAcceptors($scope));
+				$yesAcceptors[] = $type->getCallableParametersAcceptors($scope);
 			} else {
-				$maybeAcceptors = array_merge($maybeAcceptors, $type->getCallableParametersAcceptors($scope));
+				$maybeAcceptors[] = $type->getCallableParametersAcceptors($scope);
 			}
 		}
 
 		if (count($yesAcceptors) > 0) {
-			return $yesAcceptors;
+			return array_merge(...$yesAcceptors);
 		}
 
 		if (count($maybeAcceptors) > 0) {
-			return $maybeAcceptors;
+			return array_merge(...$maybeAcceptors);
 		}
 
 		throw new ShouldNotHappenException();