diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 7776e32..12ac144 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -34,5 +34,8 @@ jobs:
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress
 
-    - name: Run test suite
+    - name: Run Test Suite
       run: XDEBUG_MODE=coverage ./vendor/bin/phpunit tests --coverage-filter src --coverage-text
+    
+    - name: Run Static Analysis
+      run: ./vendor/bin/psalm
diff --git a/composer.json b/composer.json
index 85b4a44..756e601 100644
--- a/composer.json
+++ b/composer.json
@@ -34,6 +34,7 @@
     },
     "require-dev": {
         "guzzlehttp/guzzle": "^7.3",
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9.5",
+        "vimeo/psalm": "^4.7"
     }
 }
diff --git a/composer.lock b/composer.lock
index 96cc272..4a97a59 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "127239b34cdcea6b2c50e2f3175ccff3",
+    "content-hash": "94647f27c5e57136a1f5ff4d306b60b3",
     "packages": [
         {
             "name": "barnabywalters/mf-cleaner",
@@ -1076,6 +1076,427 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "amphp/amp",
+            "version": "v2.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/amp.git",
+                "reference": "efca2b32a7580087adb8aabbff6be1dc1bb924a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/efca2b32a7580087adb8aabbff6be1dc1bb924a9",
+                "reference": "efca2b32a7580087adb8aabbff6be1dc1bb924a9",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "ext-json": "*",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6.0.9 | ^7",
+                "psalm/phar": "^3.11@dev",
+                "react/promise": "^2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Amp\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php",
+                    "lib/Internal/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Daniel Lowrey",
+                    "email": "rdlowrey@php.net"
+                },
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Bob Weinand",
+                    "email": "bobwei9@hotmail.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A non-blocking concurrency framework for PHP applications.",
+            "homepage": "http://amphp.org/amp",
+            "keywords": [
+                "async",
+                "asynchronous",
+                "awaitable",
+                "concurrency",
+                "event",
+                "event-loop",
+                "future",
+                "non-blocking",
+                "promise"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/amp/issues",
+                "source": "https://github.com/amphp/amp/tree/v2.5.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/amphp",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-01-10T17:06:37+00:00"
+        },
+        {
+            "name": "amphp/byte-stream",
+            "version": "v1.8.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/byte-stream.git",
+                "reference": "acbd8002b3536485c997c4e019206b3f10ca15bd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/acbd8002b3536485c997c4e019206b3f10ca15bd",
+                "reference": "acbd8002b3536485c997c4e019206b3f10ca15bd",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2",
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1.4",
+                "friendsofphp/php-cs-fixer": "^2.3",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6 || ^7 || ^8",
+                "psalm/phar": "^3.11.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Amp\\ByteStream\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A stream abstraction to make working with non-blocking I/O simple.",
+            "homepage": "http://amphp.org/byte-stream",
+            "keywords": [
+                "amp",
+                "amphp",
+                "async",
+                "io",
+                "non-blocking",
+                "stream"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/amphp",
+                "issues": "https://github.com/amphp/byte-stream/issues",
+                "source": "https://github.com/amphp/byte-stream/tree/v1.8.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/amphp",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-30T17:13:30+00:00"
+        },
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+            "version": "1.11.99.2",
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+            },
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+                "url": "https://api.github.com/repos/composer/package-versions-deprecated/zipball/c6522afe5540d5fc46675043d3ed5a45a740b27c",
+                "reference": "c6522afe5540d5fc46675043d3ed5a45a740b27c",
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+            },
+            "require": {
+                "composer-plugin-api": "^1.1.0 || ^2.0",
+                "php": "^7 || ^8"
+            },
+            "replace": {
+                "ocramius/package-versions": "1.11.99"
+            },
+            "require-dev": {
+                "composer/composer": "^1.9.3 || ^2.0@dev",
+                "ext-zip": "^1.13",
+                "phpunit/phpunit": "^6.5 || ^7"
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+            "extra": {
+                "class": "PackageVersions\\Installer",
+                "branch-alias": {
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+                "psr-4": {
+                    "PackageVersions\\": "src/PackageVersions"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
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+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be"
+                }
+            ],
+            "description": "Composer plugin that provides efficient querying for installed package versions (no runtime IO)",
+            "support": {
+                "issues": "https://github.com/composer/package-versions-deprecated/issues",
+                "source": "https://github.com/composer/package-versions-deprecated/tree/1.11.99.2"
+            },
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+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-05-24T07:46:03+00:00"
+        },
+        {
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+            "version": "3.2.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/semver.git",
+                "reference": "31f3ea725711245195f62e54ffa402d8ef2fdba9"
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+                "shasum": ""
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+                "symfony/phpunit-bridge": "^4.2 || ^5"
+            },
+            "type": "library",
+            "extra": {
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+            "autoload": {
+                "psr-4": {
+                    "Composer\\Semver\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                },
+                {
+                    "name": "Rob Bast",
+                    "email": "rob.bast@gmail.com",
+                    "homepage": "http://robbast.nl"
+                }
+            ],
+            "description": "Semver library that offers utilities, version constraint parsing and validation.",
+            "keywords": [
+                "semantic",
+                "semver",
+                "validation",
+                "versioning"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/semver/issues",
+                "source": "https://github.com/composer/semver/tree/3.2.5"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-05-24T12:41:47+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "964adcdd3a28bf9ed5d9ac6450064e0d71ed7496"
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+                "shasum": ""
+            },
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+                "psr/log": "^1.0"
+            },
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+                "symfony/phpunit-bridge": "^4.2 || ^5"
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+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/2.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-05-05T19:37:51+00:00"
+        },
+        {
+            "name": "dnoegel/php-xdg-base-dir",
+            "version": "v0.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/dnoegel/php-xdg-base-dir.git",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/dnoegel/php-xdg-base-dir/zipball/8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "reference": "8f8a6e48c5ecb0f991c2fdcf5f154a47d85f9ffd",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~7.0|~6.0|~5.0|~4.8.35"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "XdgBaseDir\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "implementation of xdg base directory specification for php",
+            "support": {
+                "issues": "https://github.com/dnoegel/php-xdg-base-dir/issues",
+                "source": "https://github.com/dnoegel/php-xdg-base-dir/tree/v0.1.1"
+            },
+            "time": "2019-12-04T15:06:13+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.4.0",
@@ -1145,6 +1566,107 @@
             ],
             "time": "2020-11-10T18:47:58+00:00"
         },
+        {
+            "name": "felixfbecker/advanced-json-rpc",
+            "version": "v3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
+                "reference": "b5f37dbff9a8ad360ca341f3240dc1c168b45447"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/b5f37dbff9a8ad360ca341f3240dc1c168b45447",
+                "reference": "b5f37dbff9a8ad360ca341f3240dc1c168b45447",
+                "shasum": ""
+            },
+            "require": {
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
+                "php": "^7.1 || ^8.0",
+                "phpdocumentor/reflection-docblock": "^4.3.4 || ^5.0.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7.0 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "AdvancedJsonRpc\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "A more advanced JSONRPC implementation",
+            "support": {
+                "issues": "https://github.com/felixfbecker/php-advanced-json-rpc/issues",
+                "source": "https://github.com/felixfbecker/php-advanced-json-rpc/tree/v3.2.1"
+            },
+            "time": "2021-06-11T22:34:44+00:00"
+        },
+        {
+            "name": "felixfbecker/language-server-protocol",
+            "version": "1.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
+                "reference": "9d846d1f5cf101deee7a61c8ba7caa0a975cd730"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/9d846d1f5cf101deee7a61c8ba7caa0a975cd730",
+                "reference": "9d846d1f5cf101deee7a61c8ba7caa0a975cd730",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "*",
+                "squizlabs/php_codesniffer": "^3.1",
+                "vimeo/psalm": "^4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "LanguageServerProtocol\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "PHP classes for the Language Server Protocol",
+            "keywords": [
+                "language",
+                "microsoft",
+                "php",
+                "server"
+            ],
+            "support": {
+                "issues": "https://github.com/felixfbecker/php-language-server-protocol/issues",
+                "source": "https://github.com/felixfbecker/php-language-server-protocol/tree/1.5.1"
+            },
+            "time": "2021-02-22T14:02:09+00:00"
+        },
         {
             "name": "guzzlehttp/guzzle",
             "version": "7.3.0",
@@ -1361,6 +1883,57 @@
             ],
             "time": "2020-11-13T09:40:50+00:00"
         },
+        {
+            "name": "netresearch/jsonmapper",
+            "version": "v4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/cweiske/jsonmapper.git",
+                "reference": "8bbc021a8edb2e4a7ea2f8ad4fa9ec9dce2fcb8d"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/8bbc021a8edb2e4a7ea2f8ad4fa9ec9dce2fcb8d",
+                "reference": "8bbc021a8edb2e4a7ea2f8ad4fa9ec9dce2fcb8d",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "ext-pcre": "*",
+                "ext-reflection": "*",
+                "ext-spl": "*",
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~7.5 || ~8.0 || ~9.0",
+                "squizlabs/php_codesniffer": "~3.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "JsonMapper": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "OSL-3.0"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Weiske",
+                    "email": "cweiske@cweiske.de",
+                    "homepage": "http://github.com/cweiske/jsonmapper/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Map nested JSON structures onto PHP classes",
+            "support": {
+                "email": "cweiske@cweiske.de",
+                "issues": "https://github.com/cweiske/jsonmapper/issues",
+                "source": "https://github.com/cweiske/jsonmapper/tree/v4.0.0"
+            },
+            "time": "2020-12-01T19:48:11+00:00"
+        },
         {
             "name": "nikic/php-parser",
             "version": "v4.10.5",
@@ -1417,6 +1990,59 @@
             },
             "time": "2021-05-03T19:11:20+00:00"
         },
+        {
+            "name": "openlss/lib-array2xml",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nullivex/lib-array2xml.git",
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+                "reference": "f040a30e04b57fbcc9c6cbcf4dbaa96bd318b9bb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2.5",
+                "psr/container": "^1.1"
+            },
+            "suggest": {
+                "symfony/service-implementation": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "2.4-dev"
+                },
+                "thanks": {
+                    "name": "symfony/contracts",
+                    "url": "https://github.com/symfony/contracts"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Service\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to writing services",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/service-contracts/tree/v2.4.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-04-01T10:43:52+00:00"
+        },
+        {
+            "name": "symfony/string",
+            "version": "v5.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/string.git",
+                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/string/zipball/a9a0f8b6aafc5d2d1c116dcccd1573a95153515b",
+                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2.5",
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-intl-grapheme": "~1.0",
+                "symfony/polyfill-intl-normalizer": "~1.0",
+                "symfony/polyfill-mbstring": "~1.0",
+                "symfony/polyfill-php80": "~1.15"
+            },
+            "require-dev": {
+                "symfony/error-handler": "^4.4|^5.0",
+                "symfony/http-client": "^4.4|^5.0",
+                "symfony/translation-contracts": "^1.1|^2",
+                "symfony/var-exporter": "^4.4|^5.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\String\\": ""
+                },
+                "files": [
+                    "Resources/functions.php"
+                ],
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Provides an object-oriented API to strings and deals with bytes, UTF-8 code points and grapheme clusters in a unified way",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "grapheme",
+                "i18n",
+                "string",
+                "unicode",
+                "utf-8",
+                "utf8"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/string/tree/v5.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-05-26T17:43:10+00:00"
+        },
         {
             "name": "theseer/tokenizer",
             "version": "1.2.0",
@@ -3239,6 +4647,111 @@
                 }
             ],
             "time": "2020-07-12T23:59:07+00:00"
+        },
+        {
+            "name": "vimeo/psalm",
+            "version": "4.7.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vimeo/psalm.git",
+                "reference": "38c452ae584467e939d55377aaf83b5a26f19dd1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/38c452ae584467e939d55377aaf83b5a26f19dd1",
+                "reference": "38c452ae584467e939d55377aaf83b5a26f19dd1",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2.4.2",
+                "amphp/byte-stream": "^1.5",
+                "composer/package-versions-deprecated": "^1.8.0",
+                "composer/semver": "^1.4 || ^2.0 || ^3.0",
+                "composer/xdebug-handler": "^1.1 || ^2.0",
+                "dnoegel/php-xdg-base-dir": "^0.1.1",
+                "ext-dom": "*",
+                "ext-json": "*",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-simplexml": "*",
+                "ext-tokenizer": "*",
+                "felixfbecker/advanced-json-rpc": "^3.0.3",
+                "felixfbecker/language-server-protocol": "^1.5",
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
+                "nikic/php-parser": "^4.10.5",
+                "openlss/lib-array2xml": "^1.0",
+                "php": "^7.1|^8",
+                "sebastian/diff": "^3.0 || ^4.0",
+                "symfony/console": "^3.4.17 || ^4.1.6 || ^5.0",
+                "webmozart/path-util": "^2.3"
+            },
+            "provide": {
+                "psalm/psalm": "self.version"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.2",
+                "brianium/paratest": "^4.0||^6.0",
+                "ext-curl": "*",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpdocumentor/reflection-docblock": "^5",
+                "phpmyadmin/sql-parser": "5.1.0||dev-master",
+                "phpspec/prophecy": ">=1.9.0",
+                "phpunit/phpunit": "^9.0",
+                "psalm/plugin-phpunit": "^0.13",
+                "slevomat/coding-standard": "^7.0",
+                "squizlabs/php_codesniffer": "^3.5",
+                "symfony/process": "^4.3",
+                "weirdan/phpunit-appveyor-reporter": "^1.0.0",
+                "weirdan/prophecy-shim": "^1.0 || ^2.0"
+            },
+            "suggest": {
+                "ext-igbinary": "^2.0.5"
+            },
+            "bin": [
+                "psalm",
+                "psalm-language-server",
+                "psalm-plugin",
+                "psalm-refactor",
+                "psalter"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev",
+                    "dev-3.x": "3.x-dev",
+                    "dev-2.x": "2.x-dev",
+                    "dev-1.x": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psalm\\": "src/Psalm/"
+                },
+                "files": [
+                    "src/functions.php",
+                    "src/spl_object_id.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Matthew Brown"
+                }
+            ],
+            "description": "A static analysis tool for finding errors in PHP applications",
+            "keywords": [
+                "code",
+                "inspection",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/vimeo/psalm/issues",
+                "source": "https://github.com/vimeo/psalm/tree/4.7.3"
+            },
+            "time": "2021-05-24T04:09:51+00:00"
         }
     ],
     "aliases": [],
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..3e4e3d0
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="4"
+    resolveFromConfigFile="true"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+</psalm>
diff --git a/src/Server.php b/src/Server.php
index eaa8613..40b62f2 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -369,7 +369,7 @@ class Server {
 					}
 
 					// Check that this token either grants at most the profile scope.
-					$requestedScopes = explode(' ', $authCode['scope'] ?? '');
+					$requestedScopes = array_filter(explode(' ', $authCode['scope'] ?? ''));
 					if (!empty($requestedScopes) && $requestedScopes != ['profile']) {
 						$this->logger->error("An exchange request for a token granting scopes other than “profile” was sent to the authorization endpoint.");
 						throw IndieAuthException::create(IndieAuthException::INVALID_GRANT, $request);
diff --git a/src/Storage/FilesystemJsonStorage.php b/src/Storage/FilesystemJsonStorage.php
index ddd6327..7304aed 100644
--- a/src/Storage/FilesystemJsonStorage.php
+++ b/src/Storage/FilesystemJsonStorage.php
@@ -40,7 +40,7 @@ class FilesystemJsonStorage implements TokenStorageInterface, LoggerAwareInterfa
 	public function __construct(string $path, string $secret, ?int $authCodeTtl=null, ?int $accessTokenTtl=null, $cleanUpNow=false, ?LoggerInterface $logger=null) {
 		$this->logger = $logger ?? new NullLogger();
 
-		if (!is_string($secret) || strlen($secret) < 64) {
+		if (strlen($secret) < 64) {
 			throw new Exception("\$secret must be a string with a minimum length of 64 characters. Make one with Taproot\IndieAuth\generateRandomString(64)");
 		}
 		$this->secret = $secret;