Merge pull request 'fix memcache usage' (#18) from fix/backend-usable-memcached into main

Reviewed-on: #18

backend/src/persistence.py

@@ -1,4 +1,5 @@
 from pymemcache.client.base import Client
+from pymemcache import serde
 
 import constants
 
@@ -22,5 +23,6 @@ else:
         constants.MEMCACHED_HOST_PATH,
         timeout=1,
         allow_unicode_keys=True,
-        encoding='utf-8'
+        encoding='utf-8',
+        serde=serde.pickle_serde
     )