to and cc should be lists

follow.py

@@ -988,7 +988,7 @@ def send_follow_request(session, base_dir: str,
         'object': followed_id
     }
     if group_account:
-        new_follow_json['to'] = followed_id
+        new_follow_json['to'] = [followed_id]
         print('Follow request: ' + str(new_follow_json))
 
     if follow_approval_required(base_dir, nickname, domain, debug,

inbox.py

@@ -5795,6 +5795,8 @@ def _receive_follow_request(session, session_onion, session_i2p,
                   'nickname. Assuming single user instance.')
     if not message_json.get('to'):
         message_json['to'] = message_json['object']
+        if not isinstance(message_json['to'], list):
+            message_json['to'] = [message_json['to']]
     if not has_users_path(message_json['object']):
         if debug:
             print('DEBUG: users/profile/author/channel/accounts ' +

posts.py

@@ -2588,6 +2588,8 @@ def create_direct_message_post(base_dir: str,
                           auto_cw_cache)
     # mentioned recipients go into To rather than Cc
     message_json['to'] = message_json['object']['cc']
+    if not isinstance(message_json['to'], list):
+        message_json['to'] = [message_json['to']]
     message_json['object']['to'] = message_json['to']
     message_json['cc'] = []
     message_json['object']['cc'] = []