diff --git a/.gitignore b/.gitignore
index b4ba050..33ad00b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,3 @@ composer.lock
 Thumbs.db
 /phpunit.xml
 /.idea
-/.vscode
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100755
index 0000000..73e6f14
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,21 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [{
+        "label": "coding-standards",
+        "type": "shell",
+        "command": "./vendor/bin/ecs check",
+        "problemMatcher": []
+    }, {
+        "label": "coding-standards-fix",
+        "type": "shell",
+        "command": "./vendor/bin/ecs check --fix",
+        "problemMatcher": []
+    }, {
+        "label": "phpstan",
+        "type": "shell",
+        "command": "./vendor/bin/phpstan --memory-limit=1G analyze",
+        "problemMatcher": []
+    }]
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a2d092..0892a91 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v0.3.1 (2021-04-02)
+* Updated for max PHPStan conformance
+
 ## v0.3.0 (2021-03-18)
 * Implement PreparedTraceException from Glitch
 * Enabled PHP8 testing
diff --git a/README.md b/README.md
index a2ccf73..ff98248 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,23 @@
 
 Exceptional aims to offer a radically enhanced Exception framework that decouples the _meaning_ of an Exception from the underlying _implementation_ functionality.
 
+## Installation
+
+Install via Composer:
+
+```bash
+composer require decodelabs/exceptional
+```
+
+### PHP version
+
+_Please note, the final v1 releases of all Decode Labs libraries will target **PHP8** or above._
+
+Current support for earlier versions of PHP will be phased out in the coming months.
+
+
+## Usage
+
 Exceptional exceptions can be used to greatly simplify how you generate and throw errors in your code, especially if you are writing a shared library.
 
 Pass the name of your intended exception as a static call to the Exceptional base class and have a dynamic exception class created based on the most appropriate PHP Exception class along with a set of related interfaces for easier catching.
diff --git a/phpstan.neon b/phpstan.neon
index 231a2ac..16f0d34 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,4 @@
 parameters:
     paths:
         - src
-    level: 5
-    inferPrivatePropertyTypeFromConstructor: true
+    level: max
diff --git a/src/Exceptional.php b/src/Exceptional.php
index a3e5aaa..a4ef6c9 100644
--- a/src/Exceptional.php
+++ b/src/Exceptional.php
@@ -24,6 +24,8 @@ private function __construct()
 
     /**
      * Description
+     *
+     * @param array<mixed> $args
      */
     public static function __callStatic(string $type, array $args): Exception
     {
diff --git a/src/Exceptional/AutoLoader.php b/src/Exceptional/AutoLoader.php
index 02a5889..be0ebe6 100644
--- a/src/Exceptional/AutoLoader.php
+++ b/src/Exceptional/AutoLoader.php
@@ -11,6 +11,9 @@
 
 class AutoLoader
 {
+    /**
+     * @var bool
+     */
     protected static $registered = false;
 
     /**
diff --git a/src/Exceptional/Exception.php b/src/Exceptional/Exception.php
index 30ec159..2cf59ea 100644
--- a/src/Exceptional/Exception.php
+++ b/src/Exceptional/Exception.php
@@ -15,9 +15,21 @@
 
 interface Exception extends Throwable, PreparedTraceException
 {
-    public function setData($data);
+    /**
+     * @param mixed $data
+     * @return $this
+     */
+    public function setData($data): Exception;
+
+    /**
+     * @return mixed
+     */
     public function getData();
 
-    public function setHttpStatus(?int $code);
+    /**
+     * @return $this
+     */
+    public function setHttpStatus(?int $code): Exception;
+
     public function getHttpStatus(): ?int;
 }
diff --git a/src/Exceptional/ExceptionTrait.php b/src/Exceptional/ExceptionTrait.php
index 32b9ce0..76573de 100644
--- a/src/Exceptional/ExceptionTrait.php
+++ b/src/Exceptional/ExceptionTrait.php
@@ -13,6 +13,8 @@
 use DecodeLabs\Glitch\Stack\Frame;
 use DecodeLabs\Glitch\Stack\Trace;
 
+use ErrorException;
+
 trait ExceptionTrait
 {
     protected $http;
@@ -35,7 +37,7 @@ public function __construct(string $message, array $params = [])
             (int)($params['code'] ?? 0)
         ];
 
-        if ($this instanceof \ErrorException) {
+        if ($this instanceof ErrorException) {
             $args[] = (int)($params['severity'] ?? 0);
             $args[] = (string)($params['file'] ?? '');
             $args[] = (int)($params['line'] ?? 0);
diff --git a/src/Exceptional/Factory.php b/src/Exceptional/Factory.php
index 0d95cd2..8ba988f 100644
--- a/src/Exceptional/Factory.php
+++ b/src/Exceptional/Factory.php
@@ -9,6 +9,9 @@
 
 namespace DecodeLabs\Exceptional;
 
+use DecodeLabs\Exceptional\Exception as ExceptionInterface;
+
+use Exception as RootException;
 use InvalidArgumentException;
 use LogicException;
 use Throwable;
@@ -135,25 +138,72 @@ class Factory
 
     public const REWIND = 2;
 
+    /**
+     * @var array<Exception>
+     */
     private static $instances = [];
 
+    /**
+     * @var string|null
+     */
     protected $message;
+
+    /**
+     * @var array<string, mixed>
+     */
     protected $params = [];
 
+
+    /**
+     * @var string|null
+     */
     protected $baseClass;
+
+    /**
+     * @var string|null
+     */
     protected $namespace;
+
+    /**
+     * @var array<string, bool>
+     */
     protected $interfaces = [];
+
+    /**
+     * @var array<string, bool>
+     */
     protected $traits = [];
 
+
+    /**
+     * @var array<string, array>
+     */
     protected $interfaceIndex = [];
+
+    /**
+     * @var array<string, string>
+     */
     protected $interfaceDefs = [];
+
+    /**
+     * @var string
+     */
     protected $exceptionDef;
 
+    /**
+     * @var bool
+     */
     protected $autoLoad = false;
 
 
     /**
      * Generate a context specific, message oriented throwable error
+     *
+     * @param array<string> $types
+     * @param array<string, mixed> $params
+     * @param mixed $data
+     * @param array<string> $interfaces
+     * @param array<string> $traits
      */
     public static function create(
         array $types,
@@ -189,6 +239,12 @@ public static function create(
 
     /**
      * Begin new factory process
+     *
+     * @param array<string> $types
+     * @param array<string, mixed> $params
+     * @param mixed $data
+     * @param array<string> $interfaces
+     * @param array<string> $traits
      */
     protected function __construct(
         array $types,
@@ -271,6 +327,8 @@ protected function __construct(
 
     /**
      * Prepare target namespace
+     *
+     * @param array<string, mixed>|null $frame
      */
     protected function prepareTargetNamespace(?string $namespace, ?array $frame): void
     {
@@ -307,6 +365,8 @@ protected function prepareTargetNamespace(?string $namespace, ?array $frame): vo
 
     /**
      * Import type definitions
+     *
+     * @param array<string> $types
      */
     protected function importTypes(array $types): void
     {
@@ -378,7 +438,7 @@ protected function importTypes(array $types): void
             // Named class
             if (
                 class_exists($type) &&
-                is_a($type, \Exception::class, true)
+                is_a($type, RootException::class, true)
             ) {
                 if ($this->baseClass !== null) {
                     throw new InvalidArgumentException(
@@ -401,6 +461,8 @@ class_exists($type) &&
 
     /**
      * Import interface definitions
+     *
+     * @param array<string> $interfaces
      */
     protected function importInterfaces(array $interfaces): void
     {
@@ -421,6 +483,8 @@ protected function importInterfaces(array $interfaces): void
 
     /**
      * Import trait definitions
+     *
+     * @param array<string> $traits
      */
     protected function importTraits(array $traits): void
     {
@@ -498,7 +562,7 @@ protected function indexInterface(string $interface): void
         // Interface
         if (
             ($classExists = class_exists($interface)) &&
-            is_a($interface, \Exception::class, true)
+            is_a($interface, RootException::class, true)
          ) {
             $baseClass = trim($interface, '\\');
 
@@ -538,13 +602,15 @@ protected function indexInterface(string $interface): void
                 !$classExists &&
                 !isset($this->interfaceIndex[$interface])
             ) {
-                $this->interfaceIndex[$interface] = ['\\' . Exception::class];
+                $this->interfaceIndex[$interface] = ['\\' . ExceptionInterface::class];
             }
         }
     }
 
     /**
      * Index namespace interface
+     *
+     * @param array<string> $parts
      */
     protected function indexNamespaceInterfaces(array $parts): ?string
     {
@@ -631,12 +697,14 @@ protected function indexPackageInterface(string $name): void
 
     /**
      * Build interface definitions
+     *
+     * @return array<string>
      */
     protected function buildDefinitions(): array
     {
         // Ensure base class
         if ($this->baseClass === null) {
-            $this->baseClass = \Exception::class;
+            $this->baseClass = RootException::class;
         }
 
         // Create definitions for needed interfaces
@@ -658,7 +726,7 @@ protected function buildDefinitions(): array
         }
 
         if (empty($interfaces)) {
-            $interfaces[] = Exception::class;
+            $interfaces[] = ExceptionInterface::class;
         } else {
             $interfaces = array_keys($interfaces);
         }
@@ -686,6 +754,8 @@ protected function buildDefinitions(): array
 
     /**
      * Define interface
+     *
+     * @param array<string> $extends
      */
     protected function defineInterface(string $interface, array $extends): void
     {