feat(lexicon): better numeric conversion

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

Author: ArtificialOwl

lib/private/Config/ConfigManager.php

@@ -205,15 +205,15 @@ private function migrateUserConfigValue(string $userId, string $appId, ConfigLex
 	}
 
 	public function convertToInt(string $value): int {
-		if ($value !== ((string)((int)$value))) {
+		if (!is_numeric($value) || (float)$value <> (int)$value) {
 			throw new TypeConflictException('Value is not an integer');
 		}
 
 		return (int)$value;
 	}
 
 	public function convertToFloat(string $value): float {
-		if ($value !== ((string)((float)$value))) {
+		if (!is_numeric($value)) {
 			throw new TypeConflictException('Value is not a float');
 		}