diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b77eca8..0b1cae2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
         with:
           fetch-depth: 2 # required by Scrutinizer
       - run: composer install --no-progress --no-ansi --no-interaction --dev --prefer-dist
-      - run: php test/test.php
+      - run: composer test && composer inspect
       - if: matrix.coverage == 'xdebug'
         uses: sudo-bot/action-scrutinizer@latest
         with:
diff --git a/composer.json b/composer.json
index 9d9ec8d..b709551 100644
--- a/composer.json
+++ b/composer.json
@@ -18,10 +18,12 @@
         "mindplay/testies": "^1.1.2",
         "php-di/php-di": "^7.0.5",
         "pimple/pimple": "^3.5",
-        "phpunit/php-code-coverage": "^9 || ^10 || ^11"
+        "phpunit/php-code-coverage": "^9 || ^10 || ^11",
+        "phpstan/phpstan": "^1.10"
     },
     "scripts": {
-        "test": "XDEBUG_MODE=coverage php test/test.php"
+        "test": "XDEBUG_MODE=coverage php test/test.php",
+        "inspect": "phpstan"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..d7f8277
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,4 @@
+parameters:
+	level: 6
+	paths:
+		- src
diff --git a/src/Configuration.php b/src/Configuration.php
index 5432277..d78a779 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -2,33 +2,35 @@
 
 namespace mindplay\unbox;
 
+use Psr\Container\ContainerInterface;
+
 /**
  * This abstract base-class defines the internal state of `Container` and `ContainerFactory`
  */
 abstract class Configuration
 {
     /**
-     * @var mixed[] map where component name => value
+     * @var array<string,mixed> map where component name => value
      */
     protected $values = [];
 
     /**
-     * @var callable[] map where component name => factory function
+     * @var array<string,callable> map where component name => factory function
      */
     protected $factory = [];
 
     /**
-     * @var array map where component name => mixed list/map of parameter names
+     * @var array<string,array<int|string,string>> map where component name => mixed list/map of parameter names
      */
     protected $factory_map = [];
 
     /**
-     * @var callable[][] map where component name => list of configuration functions
+     * @var array<string,callable[]> map where component name => list of configuration functions
      */
     protected $config = [];
 
     /**
-     * @var callable[][] map where component name => mixed list/map of parameter names
+     * @var array<string,array<int|string,array<int|string,string>>> map where component name => mixed list/map of parameter names
      */
     protected $config_map = [];
 
@@ -51,10 +53,8 @@ public function has(string $name): bool
 
     /**
      * Internally copy configuration state, e.g. from `ContainerFactory` to `Container`
-     *
-     * @param Configuration $target
      */
-    protected function copyTo(Configuration $target)
+    protected function copyTo(Configuration $target): void
     {
         $target->values = $this->values;
         $target->factory = $this->factory;
diff --git a/src/Container.php b/src/Container.php
index 9e465bf..b8c613b 100644
--- a/src/Container.php
+++ b/src/Container.php
@@ -12,20 +12,17 @@
 class Container extends Configuration implements ContainerInterface, FactoryInterface
 {
     /**
-     * @var bool[] map where component name => TRUE, if the component has been initialized
+     * @var array<string,bool> map where component name => TRUE, if the component has been initialized
      */
     protected $active = [];
 
     /**
-     * @var int[] map where component name => activation depth
+     * @var array<string,int> map where component name => activation depth
      *
      * @see get()
      */
     private $activations = [];
 
-    /**
-     * @param Configuration $config
-     */
     public function __construct(Configuration $config)
     {
         $config->copyTo($this);
@@ -42,9 +39,11 @@ public function __construct(Configuration $config)
     /**
      * Resolve the registered component with the given name.
      *
+	 * @template T of object
+     * 
      * @param string $name component name
-     *
-     * @return mixed component instance/value
+     * 
+	 * @return ($name is class-string<T> ? T : mixed) component instance/value
      *
      * @throws NotFoundException
      */
@@ -153,8 +152,8 @@ public function isActive(string $name): bool
      *
      * See also {@see create()} which lets you invoke any constructor.
      *
-     * @param callable|object $callback any arbitrary closure or callable, or object implementing __invoke()
-     * @param mixed|mixed[]   $map      mixed list/map of parameter values (and/or boxed values)
+     * @param callable                $callback any arbitrary closure or callable
+     * @param array<int|string,mixed> $map      mixed list/map of parameter values (and/or boxed values)
      *
      * @return mixed return value from the given callable
      */
@@ -171,14 +170,14 @@ public function call(callable $callback, array $map = [])
      * The container will internally resolve and inject any constructor arguments
      * not explicitly provided in the (optional) second parameter.
      *
-     * @param string        $class_name fully-qualified class-name
-     * @param mixed|mixed[] $map        mixed list/map of parameter values (and/or boxed values)
+     * @param string                  $class_name fully-qualified class-name
+     * @param array<int|string,mixed> $map        mixed list/map of parameter values (and/or boxed values)
      *
      * @return mixed new instance of the specified class
      *
      * @throws InvalidArgumentException
      */
-    public function create(string $class_name, array $map = [])
+    public function create(string $class_name, array $map = []): mixed
     {
         if (! class_exists($class_name)) {
             throw new InvalidArgumentException("unable to create component: {$class_name} (autoloading failed)");
@@ -204,15 +203,15 @@ public function create(string $class_name, array $map = [])
      *
      * This is the heart of the beast.
      *
-     * @param ReflectionParameter[] $params parameter reflections
-     * @param array                 $map    mixed list/map of parameter values (and/or boxed values)
-     * @param bool                  $safe   if TRUE, it's considered safe to resolve against parameter names
+     * @param ReflectionParameter[]   $params parameter reflections
+     * @param array<int|string,mixed> $map    mixed list/map of parameter values (and/or boxed values)
+     * @param bool                    $safe   if TRUE, it's considered safe to resolve against parameter names
      *
-     * @return array parameters
+     * @return array<mixed> parameters
      *
      * @throws ContainerException
      */
-    protected function resolve($params, $map, $safe = true)
+    protected function resolve($params, $map, $safe = true): array
     {
         $args = [];
 
diff --git a/src/ContainerFactory.php b/src/ContainerFactory.php
index 01820e6..4ee9cb9 100644
--- a/src/ContainerFactory.php
+++ b/src/ContainerFactory.php
@@ -275,7 +275,7 @@ public function add(ProviderInterface $provider): void
      *
      * @see provides()
      */
-    public function requires(string $requirement, string $description = "")
+    public function requires(string $requirement, string $description = ""): void
     {
         $this->required[$requirement][] = $description;
     }
@@ -291,7 +291,7 @@ public function requires(string $requirement, string $description = "")
      *
      * @see requires()
      */
-    public function provides(string $requirement, string $description = "")
+    public function provides(string $requirement, string $description = ""): void
     {
         if (array_key_exists($requirement, $this->provided)) {
             $message = "The following Requirement has already been fulfilled: {$requirement}";
@@ -338,7 +338,7 @@ public function registerFallback(ContainerInterface $container): void
      *
      * @throws ContainerException if any Requirements have not been fulfilled
      */
-    public function createContainer()
+    public function createContainer(): Container
     {
         $messages = [];
 
diff --git a/src/FactoryInterface.php b/src/FactoryInterface.php
index eb90667..db29a54 100644
--- a/src/FactoryInterface.php
+++ b/src/FactoryInterface.php
@@ -14,8 +14,8 @@ interface FactoryInterface
      * The factory will internally resolve and inject any constructor arguments
      * not explicitly provided in the (optional) second parameter.
      *
-     * @param string        $class_name fully-qualified class-name
-     * @param mixed|mixed[] $map        mixed list/map of parameter values (and/or boxed values)
+     * @param string       $class_name fully-qualified class-name
+     * @param array<mixed> $map        mixed list/map of parameter values (and/or boxed values)
      *
      * @return mixed new instance of the specified class
      */
diff --git a/src/Reflection.php b/src/Reflection.php
index 007def0..0e92c9d 100644
--- a/src/Reflection.php
+++ b/src/Reflection.php
@@ -15,9 +15,9 @@
 abstract class Reflection
 {
     /**
-     * Create a Reflection of the function referenced by any type of callable (or object implementing `__invoke()`)
+     * Create a Reflection of the function referenced by any type of callable
      *
-     * @param callable|object $callback
+     * @param callable $callback
      *
      * @return ReflectionFunctionAbstract
      *