Automatic conversion of false to array is deprecated #81
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See PHP RFC: Deprecate autovivification on false https://wiki.php.net/rfc/autovivification_false
Got the error on a Drupal instance with memcache module and memcache_admin sub module enabled.
PHP: 8.1.11
Drupal core: 9.5.0-rc1
memcache module : 2.5.0
Note: in the test: memcache:11211 (hostname: memcache, port: 11211) is the memcached instance running with the docker image
bitnami/memcached:1.6.9
Location: https://example.com/admin/reports/memcache/default/memcache%3A11211
Referrer: https://example.com/admin/reports/memcache/default
Message (partial):