[Bug]: using integer-values as key in TemplateResponse

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

In old releases it was possible to using integer-values as key in TemplateResponse. Since some version it is impossible, but it is a very needed feature.

Steps to reproduce

1.create an multiple array and sort it with array_multisort
array_multisort($mysort, SORT_DESC, $myarray);

2. use this array caling TemplateResponse
   return new TemplateResponse('myapp', 'mysite', $myarray );

Expected behavior

working without error

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "aoo.arch.tu-dresden.de"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/aoo.arch.tu-dresden.de\/nextcloud",
        "dbtype": "mysql",
        "version": "33.0.0.16",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "ldapIgnoreNamingRules": false,
        "ldapProviderFactory": "\\OCA\\User_LDAP\\LDAPProviderFactory",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "sendmail",
        "mail_smtpauthtype": "PLAIN",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "theme": "",
        "loglevel": 0,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "mail_smtpsecure": "ssl",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpauth": 1,
        "skeletondirectory": "\/var\/nextcloud_defaultfiles",
        "share_folder": "\/",
        "default_language": "de",
        "app_install_overwrite": [
            "calendar",
            "groupfolders",
            "spreed",
            "mindmaps",
            "dashboard",
            "ownpad",
            "admin_notifications",
            "personenbogen",
            "dienste",
            "apporder",
            "statistik"
        ],
        "encryption.key_storage_migrated": false,
        "mysql.utf8mb4": true,
        "default_phone_region": "DE",
        "maintenance": false,
        "lost_password_link": "disabled",
        "trashbin_retention_obligation": "14",
        "defaultapp": "dienste,calendar,personenbogen",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "maintenance_window_start": "1",
        "default_locale": "de_DE",
        "opcache.interned_strings_buffer": "16",
        "twofactor_enforced": "true",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:
  - activity: 6.0.0-dev.0
  - admin_audit: 1.23.0
  - app_api: 33.0.0
  - bruteforcesettings: 6.0.0-dev.0
  - calendar: 6.2.1
  - circles: 33.0.0
  - cloud_federation_api: 1.17.0
  - comments: 1.23.0
  - contacts: 8.4.2
  - contactsinteraction: 1.14.1
  - dav: 1.36.0
  - dienste: 0.0.3
  - event_update_notification: 2.8.0
  - federatedfilesharing: 1.23.0
  - files: 2.5.0
  - files_downloadlimit: 5.1.0-dev.0
  - files_pdfviewer: 6.0.0-dev.0
  - files_reminders: 1.6.0
  - files_sharing: 1.25.2
  - files_trashbin: 1.23.0
  - files_versions: 1.26.0
  - firstrunwizard: 6.0.0-dev.0
  - forms: 5.2.5
  - logreader: 6.0.0
  - lookup_server_connector: 1.21.0
  - mail: 5.7.5
  - nextcloud_announcements: 5.0.0
  - notes: 4.13.1
  - notifications: 6.0.0
  - notify_push: 1.3.1
  - oauth2: 1.21.0
  - password_policy: 5.0.0-dev.0
  - personenbogen: 0.0.8
  - photos: 6.0.0-dev.0
  - polls: 8.6.3
  - privacy: 5.0.0-dev.0
  - profile: 1.2.0
  - provisioning_api: 1.23.0
  - qownnotesapi: 26.2.2
  - recommendations: 6.0.0-dev.0
  - richdocuments: 10.1.2
  - richdocumentscode: 25.4.904
  - serverinfo: 5.0.0-dev.0
  - settings: 1.16.0
  - sharebymail: 1.23.0
  - spreed: 23.0.2
  - statistik: 0.0.1
  - support: 5.0.0
  - survey_client: 5.0.0-dev.0
  - systemtags: 1.23.0
  - tasks: 0.17.1
  - text: 7.0.0-dev.3
  - theming: 2.8.0
  - timemanager: 0.3.23
  - twofactor_backupcodes: 1.22.0
  - twofactor_totp: 15.0.0-dev.0
  - updatenotification: 1.23.0
  - user_ldap: 1.24.0
  - user_status: 1.13.0
  - viewer: 6.0.0-dev.0
  - weather_status: 1.13.0
  - webhook_listeners: 1.5.0
  - workflowengine: 2.15.0
Disabled:
  - appointments: 2.6.3 (installed 2.6.3)
  - apporder: 0.15.0 (installed 0.15.0)
  - camerarawpreviews: 0.8.8 (installed 0.8.8)
  - dashboard: 7.13.0 (installed 6.0.0)
  - deck: 1.16.3 (installed 1.16.3)
  - documentserver_community: 0.2.1 (installed 0.2.1)
  - drawio: 4.1.4 (installed 4.1.4)
  - encryption: 2.21.0 (installed 2.2.0)
  - end_to_end_encryption: 1.18.2 (installed 1.18.2)
  - federation: 1.23.0 (installed 1.6.0)
  - files_accesscontrol: 3.0.2 (installed 3.0.2)
  - files_external: 1.25.1
  - files_retention: 3.0.0 (installed 3.0.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - files_trackdownloads: 1.11.0 (installed 1.11.0)
  - groupfolders: 20.1.12 (installed 20.1.12)
  - mindmaps: 0.1.0 (installed 0.1.0)
  - notestutorial: 17.0.0
  - onlyoffice: 9.13.0 (installed 9.13.0)
  - ownpad: 0.13.2 (installed 0.13.2)
  - related_resources: 4.0.0-dev.0 (installed 1.0.3)
  - socialsharing_telegram: 4.0.1 (installed 4.0.1)
  - suspicious_login: 11.0.0-dev.0
  - timetracker: 0.0.86 (installed 0.0.86)
  - twofactor_nextcloud_notification: 7.0.0
  - user_usage_report: 3.0.0 (installed 3.0.0)
  - workflow_pdf_converter: 3.0.0 (installed 3.0.0)

Nextcloud Signing status

Nextcloud Logs

Additional info

It can be bring back by a little patch:

--- nextcloud/lib/private/Template/Template.php
+++ nextcloud/lib/private/Template/Template.php
@@ -116,7 +116,7 @@
 
                        if (is_array($additionalParams)) {
                                foreach ($additionalParams as $key => $value) {
-                                       $page->assign($key, $value);
+                                       $page->assign(strval($key), $value);
                                }
                        }
 
--- nextcloud/lib/public/AppFramework/Http/TemplateResponse.php
+++ nextcloud/lib/public/AppFramework/Http/TemplateResponse.php
@@ -189,7 +189,7 @@
                $template = Server::get(ITemplateManager::class)->getTemplate($this->appName, $this->templateName, $renderAs);
 
                foreach ($this->params as $key => $value) {
-                       $template->assign($key, $value);
+                       $template->assign(strval($key), $value);
                }
 
                return $template->fetchPage($this->params);

Start with lib/private/Template/Template.php and lib/public/AppFramework/Http/TemplateResponse.php, focusing on how TemplateResponse passes parameters to the template. Reproduce the issue with an array sorted by array_multisort and integer keys, then verify that rendering completes without an error and preserves the supplied values.