TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in implode() (line 81 of modules/contrib/cas_attributes/src/Form/CasAttributesSettings.php). with PHP 8

Is it safe to apply the patch to production?

I got the same error and I have a bit simplified patch #2, used the null coalescing operator.

While this patch works great and removes the error, small DCS change needed before RTBC please.

+++ b/src/Form/CasAttributesSettings.php
@@ -73,12 +73,12 @@ class CasAttributesSettings extends ConfigFormBase {
+    $token_allowed_attributes = is_null($config->get('token_allowed_attributes')) ? array() : $config->get('token_allowed_attributes');

array() should be [] as mentioned https://www.drupal.org/docs/develop/standards/php/php-coding-standards#a... →

Re-rolled the patch to use null coalescing operator against 2.x.