diff --git a/src/Container.php b/src/Container.php
index 852e756..66c70a0 100644
--- a/src/Container.php
+++ b/src/Container.php
@@ -14,40 +14,17 @@
 
 class Container implements DefinitionContainerInterface
 {
-    /**
-     * @var boolean
-     */
-    protected $defaultToShared = false;
-
-    /**
-     * @var DefinitionAggregateInterface
-     */
-    protected $definitions;
-
-    /**
-     * @var ServiceProviderAggregateInterface
-     */
-    protected $providers;
-
-    /**
-     * @var InflectorAggregateInterface
-     */
-    protected $inflectors;
-
     /**
      * @var ContainerInterface[]
      */
-    protected $delegates = [];
+    protected array $delegates = [];
 
     public function __construct(
-        DefinitionAggregateInterface $definitions = null,
-        ServiceProviderAggregateInterface $providers = null,
-        InflectorAggregateInterface $inflectors = null
+        protected DefinitionAggregateInterface $definitions = new DefinitionAggregate(),
+        protected ServiceProviderAggregateInterface $providers = new ServiceProviderAggregate(),
+        protected InflectorAggregateInterface $inflectors = new InflectorAggregate(),
+        protected bool $defaultToShared = false
     ) {
-        $this->definitions = $definitions ?? new DefinitionAggregate();
-        $this->providers   = $providers   ?? new ServiceProviderAggregate();
-        $this->inflectors  = $inflectors  ?? new InflectorAggregate();
-
         if ($this->definitions instanceof ContainerAwareInterface) {
             $this->definitions->setContainer($this);
         }
@@ -61,7 +38,7 @@ public function __construct(
         }
     }
 
-    public function add(string $id, $concrete = null): DefinitionInterface
+    public function add(string $id, mixed $concrete = null): DefinitionInterface
     {
         $concrete ??= $id;
 
@@ -72,7 +49,7 @@ public function add(string $id, $concrete = null): DefinitionInterface
         return $this->definitions->add($id, $concrete);
     }
 
-    public function addShared(string $id, $concrete = null): DefinitionInterface
+    public function addShared(string $id, mixed $concrete = null): DefinitionInterface
     {
         $concrete ??= $id;
         return $this->definitions->addShared($id, $concrete);
@@ -155,7 +132,7 @@ public function delegate(ContainerInterface $container): self
         return $this;
     }
 
-    protected function resolve(string $id, bool $new = false)
+    protected function resolve(string $id, bool $new = false): mixed
     {
         if ($this->definitions->has($id)) {
             $resolved = (true === $new) ? $this->definitions->resolveNew($id) : $this->definitions->resolve($id);
@@ -177,6 +154,7 @@ protected function resolve(string $id, bool $new = false)
         if ($this->providers->provides($id)) {
             $this->providers->register($id);
 
+            /** @noinspection PhpUnreachableStatementInspection */
             if (false === $this->definitions->has($id) && false === $this->definitions->hasTag($id)) {
                 throw new ContainerException(sprintf('Service provider lied about providing (%s) service', $id));
             }
diff --git a/src/ContainerAwareTrait.php b/src/ContainerAwareTrait.php
index 1519f34..d4e7711 100644
--- a/src/ContainerAwareTrait.php
+++ b/src/ContainerAwareTrait.php
@@ -12,7 +12,7 @@ trait ContainerAwareTrait
     /**
      * @var ?DefinitionContainerInterface
      */
-    protected $container;
+    protected ?DefinitionContainerInterface $container = null;
 
     public function setContainer(DefinitionContainerInterface $container): ContainerAwareInterface
     {
diff --git a/src/Definition/Definition.php b/src/Definition/Definition.php
index a34191d..8b774f6 100644
--- a/src/Definition/Definition.php
+++ b/src/Definition/Definition.php
@@ -12,7 +12,6 @@
 };
 use League\Container\ContainerAwareTrait;
 use League\Container\Exception\ContainerException;
-use League\Container\Exception\NotFoundException;
 use Psr\Container\ContainerInterface;
 use ReflectionClass;
 
@@ -78,7 +77,7 @@ public function isShared(): bool
         return $this->shared;
     }
 
-    public function getConcrete()
+    public function getConcrete(): mixed
     {
         return $this->concrete;
     }
diff --git a/src/Definition/DefinitionAggregate.php b/src/Definition/DefinitionAggregate.php
index ec008f5..11f315a 100644
--- a/src/Definition/DefinitionAggregate.php
+++ b/src/Definition/DefinitionAggregate.php
@@ -12,19 +12,14 @@ class DefinitionAggregate implements DefinitionAggregateInterface
 {
     use ContainerAwareTrait;
 
-    /**
-     * @var DefinitionInterface[]
-     */
-    protected array $definitions = [];
-
-    public function __construct(array $definitions = [])
+    public function __construct(protected array $definitions = [])
     {
-        $this->definitions = array_filter($definitions, static function ($definition) {
+        $this->definitions = array_filter($this->definitions, static function ($definition) {
             return ($definition instanceof DefinitionInterface);
         });
     }
 
-    public function add(string $id, $definition): DefinitionInterface
+    public function add(string $id, mixed $definition): DefinitionInterface
     {
         if (false === ($definition instanceof DefinitionInterface)) {
             $definition = new Definition($id, $definition);
@@ -35,7 +30,7 @@ public function add(string $id, $definition): DefinitionInterface
         return $definition;
     }
 
-    public function addShared(string $id, $definition): DefinitionInterface
+    public function addShared(string $id, mixed $definition): DefinitionInterface
     {
         $definition = $this->add($id, $definition);
         return $definition->setShared(true);
@@ -43,7 +38,7 @@ public function addShared(string $id, $definition): DefinitionInterface
 
     public function has(string $id): bool
     {
-        foreach ($this->getIterator() as $definition) {
+        foreach ($this as $definition) {
             if ($id === $definition->getAlias()) {
                 return true;
             }
@@ -54,7 +49,7 @@ public function has(string $id): bool
 
     public function hasTag(string $tag): bool
     {
-        foreach ($this->getIterator() as $definition) {
+        foreach ($this as $definition) {
             if ($definition->hasTag($tag)) {
                 return true;
             }
@@ -65,7 +60,7 @@ public function hasTag(string $tag): bool
 
     public function getDefinition(string $id): DefinitionInterface
     {
-        foreach ($this->getIterator() as $definition) {
+        foreach ($this as $definition) {
             if ($id === $definition->getAlias()) {
                 return $definition->setContainer($this->getContainer());
             }
@@ -74,12 +69,12 @@ public function getDefinition(string $id): DefinitionInterface
         throw new NotFoundException(sprintf('Alias (%s) is not being handled as a definition.', $id));
     }
 
-    public function resolve(string $id)
+    public function resolve(string $id): mixed
     {
         return $this->getDefinition($id)->resolve();
     }
 
-    public function resolveNew(string $id)
+    public function resolveNew(string $id): mixed
     {
         return $this->getDefinition($id)->resolveNew();
     }
@@ -88,7 +83,7 @@ public function resolveTagged(string $tag): array
     {
         $arrayOf = [];
 
-        foreach ($this->getIterator() as $definition) {
+        foreach ($this as $definition) {
             if ($definition->hasTag($tag)) {
                 $arrayOf[] = $definition->setContainer($this->getContainer())->resolve();
             }
@@ -101,7 +96,7 @@ public function resolveTaggedNew(string $tag): array
     {
         $arrayOf = [];
 
-        foreach ($this->getIterator() as $definition) {
+        foreach ($this as $definition) {
             if ($definition->hasTag($tag)) {
                 $arrayOf[] = $definition->setContainer($this->getContainer())->resolveNew();
             }
diff --git a/src/Definition/DefinitionAggregateInterface.php b/src/Definition/DefinitionAggregateInterface.php
index 16a4060..918a0f9 100644
--- a/src/Definition/DefinitionAggregateInterface.php
+++ b/src/Definition/DefinitionAggregateInterface.php
@@ -9,13 +9,13 @@
 
 interface DefinitionAggregateInterface extends ContainerAwareInterface, IteratorAggregate
 {
-    public function add(string $id, $definition): DefinitionInterface;
-    public function addShared(string $id, $definition): DefinitionInterface;
+    public function add(string $id, mixed $definition): DefinitionInterface;
+    public function addShared(string $id, mixed $definition): DefinitionInterface;
     public function getDefinition(string $id): DefinitionInterface;
     public function has(string $id): bool;
     public function hasTag(string $tag): bool;
-    public function resolve(string $id);
-    public function resolveNew(string $id);
+    public function resolve(string $id): mixed;
+    public function resolveNew(string $id): mixed;
     public function resolveTagged(string $tag): array;
     public function resolveTaggedNew(string $tag): array;
 }
diff --git a/src/Definition/DefinitionInterface.php b/src/Definition/DefinitionInterface.php
index ce6c267..bc32f04 100644
--- a/src/Definition/DefinitionInterface.php
+++ b/src/Definition/DefinitionInterface.php
@@ -14,11 +14,11 @@ public function addMethodCall(string $method, array $args = []): DefinitionInter
     public function addMethodCalls(array $methods = []): DefinitionInterface;
     public function addTag(string $tag): DefinitionInterface;
     public function getAlias(): string;
-    public function getConcrete();
+    public function getConcrete(): mixed;
     public function hasTag(string $tag): bool;
     public function isShared(): bool;
-    public function resolve();
-    public function resolveNew();
+    public function resolve(): mixed;
+    public function resolveNew(): mixed;
     public function setAlias(string $id): DefinitionInterface;
     public function setConcrete($concrete): DefinitionInterface;
     public function setShared(bool $shared): DefinitionInterface;
diff --git a/src/Inflector/Inflector.php b/src/Inflector/Inflector.php
index b8f0675..29bb49a 100644
--- a/src/Inflector/Inflector.php
+++ b/src/Inflector/Inflector.php
@@ -13,29 +13,17 @@ class Inflector implements ArgumentResolverInterface, InflectorInterface
     use ArgumentResolverTrait;
     use ContainerAwareTrait;
 
-    /**
-     * @var string
-     */
-    protected $type;
-
     /**
      * @var callable|null
      */
     protected $callback;
 
-    /**
-     * @var array
-     */
-    protected $methods = [];
-
-    /**
-     * @var array
-     */
-    protected $properties = [];
-
-    public function __construct(string $type, callable $callback = null)
-    {
-        $this->type = $type;
+    public function __construct(
+        protected string $type,
+        protected $methods = [],
+        protected $properties = [],
+        ?callable $callback = null
+    ) {
         $this->callback = $callback;
     }
 
diff --git a/src/Inflector/InflectorAggregate.php b/src/Inflector/InflectorAggregate.php
index c719332..1ff79e8 100644
--- a/src/Inflector/InflectorAggregate.php
+++ b/src/Inflector/InflectorAggregate.php
@@ -14,18 +14,18 @@ class InflectorAggregate implements InflectorAggregateInterface
     /**
      * @var Inflector[]
      */
-    protected $inflectors = [];
+    protected array $inflectors = [];
 
     public function add(string $type, callable $callback = null): Inflector
     {
-        $inflector = new Inflector($type, $callback);
+        $inflector = new Inflector($type, callback: $callback);
         $this->inflectors[] = $inflector;
         return $inflector;
     }
 
     public function inflect($object)
     {
-        foreach ($this->getIterator() as $inflector) {
+        foreach ($this as $inflector) {
             $type = $inflector->getType();
 
             if ($object instanceof $type) {
diff --git a/src/ReflectionContainer.php b/src/ReflectionContainer.php
index 6971ee1..3864ab1 100644
--- a/src/ReflectionContainer.php
+++ b/src/ReflectionContainer.php
@@ -17,24 +17,18 @@ class ReflectionContainer implements ArgumentResolverInterface, ContainerInterfa
     use ArgumentResolverTrait;
     use ContainerAwareTrait;
 
-    /**
-     * @var boolean
-     */
-    protected $cacheResolutions;
-
     /**
      * @var array
      */
-    protected $cache = [];
+    protected array $cache = [];
 
-    public function __construct(bool $cacheResolutions = false)
+    public function __construct(protected bool $cacheResolutions = false)
     {
-        $this->cacheResolutions = $cacheResolutions;
     }
 
-    public function get($id, array $args = [])
+    public function get(string $id, array $args = [])
     {
-        if ($this->cacheResolutions === true && array_key_exists($id, $this->cache)) {
+        if (true === $this->cacheResolutions && array_key_exists($id, $this->cache)) {
             return $this->cache[$id];
         }
 
@@ -65,7 +59,7 @@ public function get($id, array $args = [])
         return $resolution;
     }
 
-    public function has($id): bool
+    public function has(string $id): bool
     {
         return class_exists($id);
     }
diff --git a/src/ServiceProvider/BootableServiceProviderInterface.php b/src/ServiceProvider/BootableServiceProviderInterface.php
index 1b4be06..befcc48 100644
--- a/src/ServiceProvider/BootableServiceProviderInterface.php
+++ b/src/ServiceProvider/BootableServiceProviderInterface.php
@@ -10,7 +10,7 @@ interface BootableServiceProviderInterface extends ServiceProviderInterface
      * Method will be invoked on registration of a service provider implementing
      * this interface. Provides ability for eager loading of Service Providers.
      *
-     * @return void
+     * @return never
      */
     public function boot(): void;
 }
diff --git a/src/ServiceProvider/ServiceProviderAggregate.php b/src/ServiceProvider/ServiceProviderAggregate.php
index a790b3f..f4de9ba 100644
--- a/src/ServiceProvider/ServiceProviderAggregate.php
+++ b/src/ServiceProvider/ServiceProviderAggregate.php
@@ -15,12 +15,12 @@ class ServiceProviderAggregate implements ServiceProviderAggregateInterface
     /**
      * @var ServiceProviderInterface[]
      */
-    protected $providers = [];
+    protected array $providers = [];
 
     /**
      * @var array
      */
-    protected $registered = [];
+    protected array $registered = [];
 
     public function add(ServiceProviderInterface $provider): ServiceProviderAggregateInterface
     {
@@ -38,10 +38,10 @@ public function add(ServiceProviderInterface $provider): ServiceProviderAggregat
         return $this;
     }
 
-    public function provides(string $service): bool
+    public function provides(string $id): bool
     {
-        foreach ($this->getIterator() as $provider) {
-            if ($provider->provides($service)) {
+        foreach ($this as $provider) {
+            if ($provider->provides($id)) {
                 return true;
             }
         }
@@ -62,7 +62,7 @@ public function register(string $service): void
             );
         }
 
-        foreach ($this->getIterator() as $provider) {
+        foreach ($this as $provider) {
             if (in_array($provider->getIdentifier(), $this->registered, true)) {
                 continue;
             }
diff --git a/tests/Inflector/InflectorTest.php b/tests/Inflector/InflectorTest.php
index 6c19310..ed2a9a7 100644
--- a/tests/Inflector/InflectorTest.php
+++ b/tests/Inflector/InflectorTest.php
@@ -142,7 +142,7 @@ public function setBar($bar): void
         $bar = new class {
         };
 
-        $inflector = new Inflector('Type', function ($object) use ($bar) {
+        $inflector = new Inflector('Type', callback: function ($object) use ($bar) {
             $object->setBar($bar);
         });