diff --git a/misuzu.php b/misuzu.php
index e560aa5..265984c 100644
--- a/misuzu.php
+++ b/misuzu.php
@@ -5,7 +5,7 @@ use Index\Autoloader;
 use Index\Environment;
 use Index\Data\ConnectionFailedException;
 use Index\Data\DbTools;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Config\DbConfig;
 use Misuzu\Net\IPAddress;
 use Misuzu\Users\User;
@@ -87,18 +87,18 @@ $cfg->reload();
 
 Config::init($cfg);
 
-Mailer::init($cfg->getValue('mail.method', CfgType::T_STR), [
-    'host'        => $cfg->getValue('mail.host',           CfgType::T_STR),
-    'port'        => $cfg->getValue('mail.port',           CfgType::T_INT, 25),
-    'username'    => $cfg->getValue('mail.username',       CfgType::T_STR),
-    'password'    => $cfg->getValue('mail.password',       CfgType::T_STR),
-    'encryption'  => $cfg->getValue('mail.encryption',     CfgType::T_STR),
-    'sender_name' => $cfg->getValue('mail.sender.name',    CfgType::T_STR),
-    'sender_addr' => $cfg->getValue('mail.sender.address', CfgType::T_STR),
+Mailer::init($cfg->getValue('mail.method', IConfig::T_STR), [
+    'host'        => $cfg->getValue('mail.host',           IConfig::T_STR),
+    'port'        => $cfg->getValue('mail.port',           IConfig::T_INT, 25),
+    'username'    => $cfg->getValue('mail.username',       IConfig::T_STR),
+    'password'    => $cfg->getValue('mail.password',       IConfig::T_STR),
+    'encryption'  => $cfg->getValue('mail.encryption',     IConfig::T_STR),
+    'sender_name' => $cfg->getValue('mail.sender.name',    IConfig::T_STR),
+    'sender_addr' => $cfg->getValue('mail.sender.address', IConfig::T_STR),
 ]);
 
 // replace this with a better storage mechanism
-define('MSZ_STORAGE', $cfg->getValue('storage.path', CfgType::T_STR, MSZ_ROOT . '/store'));
+define('MSZ_STORAGE', $cfg->getValue('storage.path', IConfig::T_STR, MSZ_ROOT . '/store'));
 if(!is_dir(MSZ_STORAGE))
     mkdir(MSZ_STORAGE, 0775, true);
 
@@ -148,10 +148,10 @@ if(!MSZ_DEBUG) {
 Template::init($msz, $twigCache ?? null, MSZ_DEBUG);
 
 Template::set('globals', [
-    'site_name' => $cfg->getValue('site.name', CfgType::T_STR, 'Misuzu'),
-    'site_description' => $cfg->getValue('site.desc', CfgType::T_STR),
-    'site_url' => $cfg->getValue('site.url', CfgType::T_STR),
-    'site_twitter' => $cfg->getValue('social.twitter', CfgType::T_STR),
+    'site_name' => $cfg->getValue('site.name', IConfig::T_STR, 'Misuzu'),
+    'site_description' => $cfg->getValue('site.desc', IConfig::T_STR),
+    'site_url' => $cfg->getValue('site.url', IConfig::T_STR),
+    'site_twitter' => $cfg->getValue('social.twitter', IConfig::T_STR),
 ]);
 
 Template::addPath(MSZ_TEMPLATES);
@@ -203,7 +203,7 @@ if($authToken->isValid()) {
     }
 }
 
-CSRF::setGlobalSecretKey($cfg->getValue('csrf.secret', CfgType::T_STR, 'soup'));
+CSRF::setGlobalSecretKey($cfg->getValue('csrf.secret', IConfig::T_STR, 'soup'));
 CSRF::setGlobalIdentity(
     UserSession::hasCurrent()
         ? UserSession::getCurrent()->getToken()
@@ -213,15 +213,15 @@ CSRF::setGlobalIdentity(
 function mszLockdown(): void {
     global $misuzuBypassLockdown, $cfg;
 
-    if($cfg->getValue('private.enabled', CfgType::T_BOOL)) {
+    if($cfg->getValue('private.enabled', IConfig::T_BOOL)) {
         $onLoginPage = $_SERVER['PHP_SELF'] === url('auth-login');
         $onPasswordPage = parse_url($_SERVER['PHP_SELF'], PHP_URL_PATH) === url('auth-forgot');
         $misuzuBypassLockdown = !empty($misuzuBypassLockdown) || $onLoginPage;
 
         if(!$misuzuBypassLockdown) {
             if(UserSession::hasCurrent()) {
-                $privatePermCat = $cfg->getValue('private.perm.cat', CfgType::T_STR);
-                $privatePermVal = $cfg->getValue('private.perm.val', CfgType::T_INT);
+                $privatePermCat = $cfg->getValue('private.perm.cat', IConfig::T_STR);
+                $privatePermVal = $cfg->getValue('private.perm.val', IConfig::T_INT);
 
                 if(!empty($privatePermCat) && $privatePermVal > 0) {
                     if(!perms_check_user($privatePermCat, User::getCurrent()->getId(), $privatePermVal)) {
@@ -230,7 +230,7 @@ function mszLockdown(): void {
                         User::unsetCurrent();
                     }
                 }
-            } elseif(!$onLoginPage && !($onPasswordPage && $cfg->getValue('private.allow_password_reset', CfgType::T_BOOL, true))) {
+            } elseif(!$onLoginPage && !($onPasswordPage && $cfg->getValue('private.allow_password_reset', IConfig::T_BOOL, true))) {
                 url_redirect('auth-login');
                 exit;
             }
diff --git a/public/auth/login.php b/public/auth/login.php
index 9160e61..e7e84c1 100644
--- a/public/auth/login.php
+++ b/public/auth/login.php
@@ -2,7 +2,7 @@
 namespace Misuzu;
 
 use Misuzu\AuthToken;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 use Misuzu\Users\UserNotFoundException;
 use Misuzu\Users\UserAuthSession;
@@ -42,9 +42,9 @@ if(!empty($_GET['resolve'])) {
 
 $notices = [];
 $ipAddress = $_SERVER['REMOTE_ADDR'];
-$siteIsPrivate = $cfg->getValue('private.enable', CfgType::T_BOOL);
-$loginPermCat = $siteIsPrivate ? $cfg->getValue('private.perm.cat', CfgType::T_STR) : '';
-$loginPermVal = $siteIsPrivate ? $cfg->getValue('private.perm.val', CfgType::T_INT) : 0;
+$siteIsPrivate = $cfg->getValue('private.enable', IConfig::T_BOOL);
+$loginPermCat = $siteIsPrivate ? $cfg->getValue('private.perm.cat', IConfig::T_STR) : '';
+$loginPermVal = $siteIsPrivate ? $cfg->getValue('private.perm.val', IConfig::T_INT) : 0;
 $remainingAttempts = UserLoginAttempt::remaining($ipAddress);
 
 while(!empty($_POST['login']) && is_array($_POST['login'])) {
@@ -133,8 +133,8 @@ $loginUsername = !empty($_POST['login']['username']) && is_string($_POST['login'
     !empty($_GET['username']) && is_string($_GET['username']) ? $_GET['username'] : ''
 );
 $loginRedirect = $welcomeMode ? url('index') : (!empty($_GET['redirect']) && is_string($_GET['redirect']) ? $_GET['redirect'] : null) ?? $_SERVER['HTTP_REFERER'] ?? url('index');
-$sitePrivateMessage = $siteIsPrivate ? $cfg->getValue('private.msg', CfgType::T_STR) : '';
-$canResetPassword = $siteIsPrivate ? $cfg->getValue('private.allow_password_reset', CfgType::T_BOOL, true) : true;
+$sitePrivateMessage = $siteIsPrivate ? $cfg->getValue('private.msg', IConfig::T_STR) : '';
+$canResetPassword = $siteIsPrivate ? $cfg->getValue('private.allow_password_reset', IConfig::T_BOOL, true) : true;
 $canRegisterAccount = !$siteIsPrivate;
 
 Template::render('auth.login', [
diff --git a/public/auth/password.php b/public/auth/password.php
index 6711d1b..5b1b8de 100644
--- a/public/auth/password.php
+++ b/public/auth/password.php
@@ -2,7 +2,7 @@
 namespace Misuzu;
 
 use Misuzu\AuditLog;
-use Misuzu\Config\CfgType;
+IConfiguse Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 use Misuzu\Users\UserNotFoundException;
 use Misuzu\Users\UserLoginAttempt;
@@ -34,8 +34,8 @@ if($userId > 0)
 
 $notices = [];
 $ipAddress = $_SERVER['REMOTE_ADDR'];
-$siteIsPrivate = $cfg->getValue('private.enable', CfgType::T_BOOL);
-$canResetPassword = $siteIsPrivate ? $cfg->getValue('private.allow_password_reset', CfgType::T_BOOL, true) : true;
+$siteIsPrivate = $cfg->getValue('private.enable', IConfig::T_BOOL);
+$canResetPassword = $siteIsPrivate ? $cfg->getValue('private.allow_password_reset', IConfig::T_BOOL, true) : true;
 $remainingAttempts = UserLoginAttempt::remaining($ipAddress);
 
 while($canResetPassword) {
diff --git a/public/forum/leaderboard.php b/public/forum/leaderboard.php
index 98dded7..dc6951f 100644
--- a/public/forum/leaderboard.php
+++ b/public/forum/leaderboard.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu;
 
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 
 require_once '../../misuzu.php';
@@ -21,8 +21,8 @@ $leaderboardIdLength = strlen($leaderboardId);
 $leaderboardYear  = $leaderboardIdLength === 4 || $leaderboardIdLength === 6 ? substr($leaderboardId, 0, 4) : null;
 $leaderboardMonth = $leaderboardIdLength === 6 ? substr($leaderboardId, 4, 2) : null;
 
-$unrankedForums = !empty($_GET['allow_unranked']) ? [] : $cfg->getValue('forum_leader.unranked.forum', CfgType::T_ARR);
-$unrankedTopics = !empty($_GET['allow_unranked']) ? [] : $cfg->getValue('forum_leader.unranked.topic', CfgType::T_ARR);
+$unrankedForums = !empty($_GET['allow_unranked']) ? [] : $cfg->getValue('forum_leader.unranked.forum', IConfig::T_ARR);
+$unrankedTopics = !empty($_GET['allow_unranked']) ? [] : $cfg->getValue('forum_leader.unranked.topic', IConfig::T_ARR);
 $leaderboards = forum_leaderboard_categories();
 $leaderboard = forum_leaderboard_listing($leaderboardYear, $leaderboardMonth, $unrankedForums, $unrankedTopics);
 
diff --git a/public/manage/general/setting.php b/public/manage/general/setting.php
index 6c06037..be1e766 100644
--- a/public/manage/general/setting.php
+++ b/public/manage/general/setting.php
@@ -3,7 +3,7 @@ namespace Misuzu;
 
 use Misuzu\Config;
 use Misuzu\Config\CfgTools;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 
 require_once '../../../misuzu.php';
@@ -106,7 +106,7 @@ if($cfg->hasValue($sName)) {
     $sValue = $cfg->getValue($sName);
     $sVar['type'] = $sType = CfgTools::type($sValue);
 
-    if($sType === CfgType::T_ARR)
+    if($sType === IConfig::T_ARR)
         foreach($sValue as $fk => $fv)
             $sValue[$fk] = ['integer' => 'i', 'string' => 's', 'boolean' => 'b'][gettype($fv)] . ':' . $fv;
     
diff --git a/public/manage/general/settings.php b/public/manage/general/settings.php
index 87966e2..50e7a5c 100644
--- a/public/manage/general/settings.php
+++ b/public/manage/general/settings.php
@@ -3,7 +3,7 @@ namespace Misuzu;
 
 use Misuzu\Config;
 use Misuzu\Config\CfgTools;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 
 require_once '../../../misuzu.php';
@@ -14,7 +14,7 @@ if(!User::hasCurrent()
     return;
 }
 
-$hidden = $cfg->getValue('settings.hidden', CfgType::T_ARR, []);
+$hidden = $cfg->getValue('settings.hidden', IConfig::T_ARR, []);
 
 $vars = [];
 foreach($cfg->getNames() as $key) {
diff --git a/public/manage/general/twitter.php b/public/manage/general/twitter.php
index c3c0b2d..2637af5 100644
--- a/public/manage/general/twitter.php
+++ b/public/manage/general/twitter.php
@@ -1,7 +1,6 @@
 <?php
 namespace Misuzu;
 
-use Misuzu\Config\CfgType;
 use Misuzu\Users\User;
 use Misuzu\Twitter\TwitterAccessToken;
 use Misuzu\Twitter\TwitterClient;
diff --git a/public/manage/news/post.php b/public/manage/news/post.php
index 862cc75..106ff03 100644
--- a/public/manage/news/post.php
+++ b/public/manage/news/post.php
@@ -2,7 +2,6 @@
 namespace Misuzu;
 
 use Misuzu\AuditLog;
-use Misuzu\Config\CfgType;
 use Misuzu\News\NewsCategory;
 use Misuzu\News\NewsPost;
 use Misuzu\News\NewsPostNotFoundException;
diff --git a/public/settings/account.php b/public/settings/account.php
index 5ad5e83..b6c3a36 100644
--- a/public/settings/account.php
+++ b/public/settings/account.php
@@ -3,7 +3,7 @@ namespace Misuzu;
 
 use Misuzu\AuditLog;
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 use Misuzu\Users\UserRole;
 use Misuzu\Users\UserRoleNotFoundException;
@@ -50,7 +50,7 @@ if(!$isRestricted && $isVerifiedRequest && !empty($_POST['role'])) {
 if($isVerifiedRequest && isset($_POST['tfa']['enable']) && $currentUser->hasTOTP() !== (bool)$_POST['tfa']['enable']) {
     if((bool)$_POST['tfa']['enable']) {
         $tfaKey = TOTP::generateKey();
-        $tfaIssuer = $cfg->getValue('site.name', CfgType::T_STR, 'Misuzu');
+        $tfaIssuer = $cfg->getValue('site.name', IConfig::T_STR, 'Misuzu');
         $tfaQrcode = (new QRCode(new QROptions([
             'version'    => 5,
             'outputType' => QRCode::OUTPUT_IMAGE_JPG,
diff --git a/src/Config.php b/src/Config.php
index 43ad961..1f75986 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -2,7 +2,6 @@
 namespace Misuzu;
 
 use Misuzu\Config\IConfig;
-use Misuzu\Config\CfgType;
 
 final class Config {
     private static IConfig $config;
@@ -15,7 +14,7 @@ final class Config {
         return self::$config->getNames();
     }
 
-    public static function get(string $key, string $type = CfgType::T_ANY, $default = null): mixed {
+    public static function get(string $key, string $type = IConfig::T_ANY, $default = null): mixed {
         return self::$config->getValue($key, $type, $default);
     }
 
diff --git a/src/Config/CfgTools.php b/src/Config/CfgTools.php
index 2562e7b..a84d3f1 100644
--- a/src/Config/CfgTools.php
+++ b/src/Config/CfgTools.php
@@ -7,10 +7,10 @@ final class CfgTools {
     }
 
     public static function isValidType(string $type): bool {
-        return $type === CfgType::T_ARR
-            || $type === CfgType::T_BOOL
-            || $type === CfgType::T_INT
-            || $type === CfgType::T_STR;
+        return $type === IConfig::T_ARR
+            || $type === IConfig::T_BOOL
+            || $type === IConfig::T_INT
+            || $type === IConfig::T_STR;
     }
 
     public static function validateName(string $name): bool {
@@ -19,11 +19,11 @@ final class CfgTools {
     }
 
     private const DEFAULTS = [
-        CfgType::T_ANY => null,
-        CfgType::T_STR => '',
-        CfgType::T_INT => 0,
-        CfgType::T_BOOL => false,
-        CfgType::T_ARR => [],
+        IConfig::T_ANY => null,
+        IConfig::T_STR => '',
+        IConfig::T_INT => 0,
+        IConfig::T_BOOL => false,
+        IConfig::T_ARR => [],
     ];
 
     public static function default(string $type) {
diff --git a/src/Config/CfgType.php b/src/Config/CfgType.php
deleted file mode 100644
index e6407b5..0000000
--- a/src/Config/CfgType.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-namespace Misuzu\Config;
-
-final class CfgType {
-    public const T_ANY = '';
-    public const T_STR = 'string';
-    public const T_INT = 'integer';
-    public const T_BOOL = 'boolean';
-    public const T_ARR = 'array';
-}
diff --git a/src/Config/DbConfig.php b/src/Config/DbConfig.php
index 9a116da..163d37d 100644
--- a/src/Config/DbConfig.php
+++ b/src/Config/DbConfig.php
@@ -34,10 +34,10 @@ class DbConfig implements IConfig {
         return array_keys($this->values);
     }
 
-    public function getValue(string $name, string $type = CfgType::T_ANY, $default = null): mixed {
+    public function getValue(string $name, string $type = IConfig::T_ANY, $default = null): mixed {
         $value = $this->values[$name] ?? null;
 
-        if($type !== CfgType::T_ANY && CfgTools::type($value) !== $type)
+        if($type !== IConfig::T_ANY && CfgTools::type($value) !== $type)
             $value = null;
 
         return $value ?? $default ?? CfgTools::default($type);
diff --git a/src/Config/IConfig.php b/src/Config/IConfig.php
index 1865686..d175972 100644
--- a/src/Config/IConfig.php
+++ b/src/Config/IConfig.php
@@ -8,10 +8,16 @@ namespace Misuzu\Config;
 // bulk operations for setValue and removeValue would also be cool
 
 interface IConfig {
-    function scopeTo(string $prefix): IConfig;
-    function getNames(): array;
-    function getValue(string $name, string $type = CfgType::T_ANY, $default = null): mixed;
-    function hasValue(string $name): bool;
-    function setValue(string $name, $value, bool $save = true): void;
-    function removeValue(string $name, bool $save = true): void;
+    public const T_ANY = '';
+    public const T_STR = 'string';
+    public const T_INT = 'integer';
+    public const T_BOOL = 'boolean';
+    public const T_ARR = 'array';
+
+    public function scopeTo(string $prefix): IConfig;
+    public function getNames(): array;
+    public function getValue(string $name, string $type = IConfig::T_ANY, $default = null): mixed;
+    public function hasValue(string $name): bool;
+    public function setValue(string $name, $value, bool $save = true): void;
+    public function removeValue(string $name, bool $save = true): void;
 }
diff --git a/src/Config/ScopedConfig.php b/src/Config/ScopedConfig.php
index 5423b9f..99f04f7 100644
--- a/src/Config/ScopedConfig.php
+++ b/src/Config/ScopedConfig.php
@@ -40,7 +40,7 @@ class ScopedConfig implements IConfig {
         return $filter;
     }
 
-    public function getValue(string $name, string $type = CfgType::T_ANY, $default = null): mixed {
+    public function getValue(string $name, string $type = IConfig::T_ANY, $default = null): mixed {
         return $this->config->getValue($this->getName($name), $type, $default);
     }
 
diff --git a/src/GeoIP/GeoIPHelper.php b/src/GeoIP/GeoIPHelper.php
index 8aecef6..de9a85d 100644
--- a/src/GeoIP/GeoIPHelper.php
+++ b/src/GeoIP/GeoIPHelper.php
@@ -10,7 +10,6 @@ use GeoIp2\Model\Asn;
 use GeoIp2\Model\City;
 use GeoIp2\Model\Country;
 use Misuzu\Config\IConfig;
-use Misuzu\Config\CfgType;
 
 class GeoIPHelper {
     public const ASN = 'asn';
@@ -34,7 +33,7 @@ class GeoIPHelper {
         $type = 'db.' . $type;
         if(!$this->config->hasValue($type))
             throw new RuntimeException('Not database path has been configured for $type.');
-        return $this->config->getValue($type, CfgType::T_STR);
+        return $this->config->getValue($type, IConfig::T_STR);
     }
 
     public function getReader(string $type): Reader {
diff --git a/src/Http/Handlers/ChangelogHandler.php b/src/Http/Handlers/ChangelogHandler.php
index bdbc70b..103e996 100644
--- a/src/Http/Handlers/ChangelogHandler.php
+++ b/src/Http/Handlers/ChangelogHandler.php
@@ -3,7 +3,7 @@ namespace Misuzu\Http\Handlers;
 
 use ErrorException;
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Pagination;
 use Misuzu\Template;
 use Misuzu\Changelog\ChangelogChange;
@@ -84,8 +84,8 @@ class ChangelogHandler extends Handler {
         $changes = ChangelogChange::all(new Pagination(10));
 
         $feed = (new Feed)
-            ->setTitle(Config::get('site.name', CfgType::T_STR, 'Misuzu') . ' » Changelog')
-            ->setDescription('Live feed of changes to ' . Config::get('site.name', CfgType::T_STR, 'Misuzu') . '.')
+            ->setTitle(Config::get('site.name', IConfig::T_STR, 'Misuzu') . ' » Changelog')
+            ->setDescription('Live feed of changes to ' . Config::get('site.name', IConfig::T_STR, 'Misuzu') . '.')
             ->setContentUrl(url_prefix(false) . url('changelog-index'))
             ->setFeedUrl(url_prefix(false) . url("changelog-feed-{$feedMode}"));
 
diff --git a/src/Http/Handlers/HomeHandler.php b/src/Http/Handlers/HomeHandler.php
index d322ab8..5bd7389 100644
--- a/src/Http/Handlers/HomeHandler.php
+++ b/src/Http/Handlers/HomeHandler.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Http\Handlers;
 
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\DB;
 use Misuzu\Pagination;
 use Misuzu\Template;
@@ -20,12 +20,12 @@ final class HomeHandler extends Handler {
     }
 
     public function landing($response, $request): void {
-        $linkedData = Config::get('social.embed_linked', CfgType::T_BOOL)
+        $linkedData = Config::get('social.embed_linked', IConfig::T_BOOL)
             ? [
-                'name' => Config::get('site.name', CfgType::T_STR, 'Misuzu'),
-                'url' => Config::get('site.url', CfgType::T_STR),
-                'logo' => Config::get('site.ext_logo', CfgType::T_STR),
-                'same_as' => Config::get('social.linked', CfgType::T_ARR),
+                'name' => Config::get('site.name', IConfig::T_STR, 'Misuzu'),
+                'url' => Config::get('site.url', IConfig::T_STR),
+                'logo' => Config::get('site.ext_logo', IConfig::T_STR),
+                'same_as' => Config::get('social.linked', IConfig::T_ARR),
             ] : null;
 
 
@@ -52,7 +52,7 @@ final class HomeHandler extends Handler {
         )->fetchAll();
 
         // TODO: don't hardcode forum ids
-        $featuredForums = Config::get('landing.forum_categories', CfgType::T_ARR);
+        $featuredForums = Config::get('landing.forum_categories', IConfig::T_ARR);
 
         $popularTopics = [];
         $activeTopics = [];
diff --git a/src/Http/Handlers/NewsHandler.php b/src/Http/Handlers/NewsHandler.php
index f48a1d9..41ca4fe 100644
--- a/src/Http/Handlers/NewsHandler.php
+++ b/src/Http/Handlers/NewsHandler.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Http\Handlers;
 
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\DB;
 use Misuzu\Pagination;
 use Misuzu\Template;
@@ -86,7 +86,7 @@ final class NewsHandler extends Handler {
         $posts = $hasCategory ? $categoryInfo->posts($pagination) : NewsPost::all($pagination, true);
 
         $feed = (new Feed)
-            ->setTitle(Config::get('site.name', CfgType::T_STR, 'Misuzu') . ' » ' . ($hasCategory ? $categoryInfo->getName() : 'Featured News'))
+            ->setTitle(Config::get('site.name', IConfig::T_STR, 'Misuzu') . ' » ' . ($hasCategory ? $categoryInfo->getName() : 'Featured News'))
             ->setDescription($hasCategory ? $categoryInfo->getDescription() : 'A live featured news feed.')
             ->setContentUrl(url_prefix(false) . ($hasCategory ? url('news-category', ['category' => $categoryInfo->getId()]) : url('news-index')))
             ->setFeedUrl(url_prefix(false) . ($hasCategory ? url("news-category-feed-{$feedMode}", ['category' => $categoryInfo->getId()]) : url("news-feed-{$feedMode}")));
diff --git a/src/SharpChat/SharpChatRoutes.php b/src/SharpChat/SharpChatRoutes.php
index b36ef84..b5a2dd0 100644
--- a/src/SharpChat/SharpChatRoutes.php
+++ b/src/SharpChat/SharpChatRoutes.php
@@ -4,7 +4,6 @@ namespace Misuzu\SharpChat;
 use Index\Colour\Colour;
 use Index\Routing\IRouter;
 use Misuzu\Config\IConfig;
-use Misuzu\Config\CfgType;
 
 // Replace
 use Misuzu\AuthToken;
@@ -22,10 +21,10 @@ final class SharpChatRoutes {
     public function __construct(IRouter $router, IConfig $config) {
         $this->config = $config;
 
-        $hashKey = $this->config->getValue('hashKey', CfgType::T_STR, '');
+        $hashKey = $this->config->getValue('hashKey', IConfig::T_STR, '');
 
         if(empty($hashKey)) {
-            $hashKeyPath = $this->config->getValue('hashKeyPath', CfgType::T_STR, '');
+            $hashKeyPath = $this->config->getValue('hashKeyPath', IConfig::T_STR, '');
             if(is_file($hashKeyPath))
                 $this->hashKey = file_get_contents($hashKeyPath);
         } else {
@@ -74,7 +73,7 @@ final class SharpChatRoutes {
     public function login($response, $request): void {
         $currentUser = User::getCurrent();
         $configKey = $request->hasParam('legacy') ? 'chatPath.legacy' : 'chatPath.normal';
-        $chatPath = $this->config->getValue($configKey, CfgType::T_STR, '/');
+        $chatPath = $this->config->getValue($configKey, IConfig::T_STR, '/');
 
         $response->redirect(
             $currentUser === null
@@ -89,7 +88,7 @@ final class SharpChatRoutes {
         $originHost = strtolower(parse_url($origin, PHP_URL_HOST) ?? '');
 
         if(!empty($originHost) && $originHost !== $host) {
-            $whitelist = $this->config->getValue('origins', CfgType::T_ARR, []);
+            $whitelist = $this->config->getValue('origins', IConfig::T_ARR, []);
 
             if(!in_array($originHost, $whitelist))
                 return 403;
diff --git a/src/Twitter/TwitterAccessToken.php b/src/Twitter/TwitterAccessToken.php
index f3220dd..919c159 100644
--- a/src/Twitter/TwitterAccessToken.php
+++ b/src/Twitter/TwitterAccessToken.php
@@ -3,7 +3,6 @@ namespace Misuzu\Twitter;
 
 use Stringable;
 use Misuzu\Config\IConfig;
-use Misuzu\Config\CfgType;
 
 class TwitterAccessToken implements Stringable {
     public function __construct(
@@ -66,11 +65,11 @@ class TwitterAccessToken implements Stringable {
 
     public static function load(IConfig $config): self {
         return new static(
-            $config->getValue('type', CfgType::T_STR),
-            $config->getValue('token', CfgType::T_STR),
-            $config->getValue('expires', CfgType::T_INT),
-            $config->getValue('token', CfgType::T_ARR),
-            $config->getValue('refresh', CfgType::T_STR)
+            $config->getValue('type', IConfig::T_STR),
+            $config->getValue('token', IConfig::T_STR),
+            $config->getValue('expires', IConfig::T_INT),
+            $config->getValue('token', IConfig::T_ARR),
+            $config->getValue('refresh', IConfig::T_STR)
         );
     }
 
diff --git a/src/Twitter/TwitterClientId.php b/src/Twitter/TwitterClientId.php
index 3ade07e..ca92344 100644
--- a/src/Twitter/TwitterClientId.php
+++ b/src/Twitter/TwitterClientId.php
@@ -3,7 +3,6 @@ namespace Misuzu\Twitter;
 
 use Stringable;
 use Misuzu\Config\IConfig;
-use Misuzu\Config\CfgType;
 
 class TwitterClientId implements Stringable {
     public function __construct(
@@ -29,8 +28,8 @@ class TwitterClientId implements Stringable {
 
     public static function load(IConfig $config): self {
         return new static(
-            $config->getValue('clientId', CfgType::T_STR),
-            $config->getValue('clientSecret', CfgType::T_STR)
+            $config->getValue('clientId', IConfig::T_STR),
+            $config->getValue('clientSecret', IConfig::T_STR)
         );
     }
 }
diff --git a/src/Users/Assets/UserAvatarAsset.php b/src/Users/Assets/UserAvatarAsset.php
index 683c610..d52a99c 100644
--- a/src/Users/Assets/UserAvatarAsset.php
+++ b/src/Users/Assets/UserAvatarAsset.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Users\Assets;
 
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Imaging\Image;
 use Misuzu\Users\User;
 
@@ -20,13 +20,13 @@ class UserAvatarAsset extends UserImageAsset implements UserAssetScalableInterfa
     private const MAX_BYTES  = 1048576;
 
     public function getMaxWidth(): int {
-        return Config::get('avatar.max_res', CfgType::T_INT, self::MAX_RES);
+        return Config::get('avatar.max_res', IConfig::T_INT, self::MAX_RES);
     }
     public function getMaxHeight(): int {
         return $this->getMaxWidth();
     }
     public function getMaxBytes(): int {
-        return Config::get('avatar.max_size', CfgType::T_INT, self::MAX_BYTES);
+        return Config::get('avatar.max_size', IConfig::T_INT, self::MAX_BYTES);
     }
 
     public function getUrl(): string {
diff --git a/src/Users/Assets/UserBackgroundAsset.php b/src/Users/Assets/UserBackgroundAsset.php
index 06cafe7..786d68f 100644
--- a/src/Users/Assets/UserBackgroundAsset.php
+++ b/src/Users/Assets/UserBackgroundAsset.php
@@ -3,7 +3,7 @@ namespace Misuzu\Users\Assets;
 
 use InvalidArgumentException;
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 
 // attachment and attributes are to be stored in the same byte
@@ -49,13 +49,13 @@ class UserBackgroundAsset extends UserImageAsset {
     }
 
     public function getMaxWidth(): int {
-        return Config::get('background.max_width', CfgType::T_INT, self::MAX_WIDTH);
+        return Config::get('background.max_width', IConfig::T_INT, self::MAX_WIDTH);
     }
     public function getMaxHeight(): int {
-        return Config::get('background.max_height', CfgType::T_INT, self::MAX_HEIGHT);
+        return Config::get('background.max_height', IConfig::T_INT, self::MAX_HEIGHT);
     }
     public function getMaxBytes(): int {
-        return Config::get('background.max_size', CfgType::T_INT, self::MAX_BYTES);
+        return Config::get('background.max_size', IConfig::T_INT, self::MAX_BYTES);
     }
 
     public function getUrl(): string {
diff --git a/src/Users/Assets/UserImageAsset.php b/src/Users/Assets/UserImageAsset.php
index ef5eed5..b8358eb 100644
--- a/src/Users/Assets/UserImageAsset.php
+++ b/src/Users/Assets/UserImageAsset.php
@@ -3,7 +3,7 @@ namespace Misuzu\Users\Assets;
 
 use JsonSerializable;
 use Misuzu\Config;
-use Misuzu\Config\CfgType;
+use Misuzu\Config\IConfig;
 use Misuzu\Users\User;
 
 class UserImageAssetFileCreationFailedException extends UserAssetException {}
@@ -84,7 +84,7 @@ abstract class UserImageAsset implements JsonSerializable, UserImageAssetInterfa
     }
 
     public function getStoragePath(): string {
-        return Config::get('storage.path', CfgType::T_STR, MSZ_ROOT . DIRECTORY_SEPARATOR . 'store');
+        return Config::get('storage.path', IConfig::T_STR, MSZ_ROOT . DIRECTORY_SEPARATOR . 'store');
     }
 
     public function getPath(): string {