Vastly improves the logic around bound datasets to make them more user friendly.

src/Concerns/Testable.php

@@ -7,8 +7,10 @@ namespace Pest\Concerns;
 use Closure;
 use Pest\Support\ChainableClosure;
 use Pest\Support\ExceptionTrace;
+use Pest\Support\Reflection;
 use Pest\TestSuite;
 use PHPUnit\Framework\ExecutionOrderDependency;
+use function sprintf;
 use Throwable;
 
 /**
@@ -257,7 +259,7 @@ trait Testable
      */
     public function toString(): string
     {
-        return \sprintf(
+        return sprintf(
             '%s::%s',
             self::$__filename,
             $this->__description
@@ -283,9 +285,28 @@ trait Testable
      */
     private function resolveTestArguments(array $arguments): array
     {
-        return array_map(function ($data) {
-            return $data instanceof Closure ? $this->__callClosure($data, []) : $data;
-        }, $arguments);
+        if (count($arguments) !== 1) {
+            return $arguments;
+        }
+
+        if (!$arguments[0] instanceof Closure) {
+            return $arguments;
+        }
+
+        $underlyingTest     = Reflection::getFunctionVariable($this->__test, 'factoryTest');
+        $testParameterTypes = array_values(Reflection::getFunctionArguments($underlyingTest));
+
+        if (in_array($testParameterTypes[0], ['Closure', 'callable'])) {
+            return $arguments;
+        }
+
+        $boundDatasetResult = $this->__callClosure($arguments[0], []);
+
+        if (count($testParameterTypes) === 1 || !is_array($boundDatasetResult)) {
+            return [$boundDatasetResult];
+        }
+
+        return array_values($boundDatasetResult);
     }
 
     /**

src/Support/Reflection.php

@@ -204,4 +204,12 @@ final class Reflection
 
         return $arguments;
     }
+
+    /**
+     * @return mixed
+     */
+    public static function getFunctionVariable(Closure $function, string $key)
+    {
+        return (new ReflectionFunction($function))->getStaticVariables()[$key] ?? null;
+    }
 }