diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 62aa9a2da8..6f15c68240 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -383,7 +383,7 @@ class DirectoryHandler(BaseHandler):
"""
creator = await self.store.get_room_alias_creator(alias.to_string())
- if creator is not None and creator == user_id:
+ if creator == user_id:
return True
# Resolve the alias to the corresponding room.
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index d5f7c78edf..f1a6699cd4 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -962,8 +962,6 @@ class RoomCreationHandler(BaseHandler):
try:
random_string = stringutils.random_string(18)
gen_room_id = RoomID(random_string, self.hs.hostname).to_string()
- if isinstance(gen_room_id, bytes):
- gen_room_id = gen_room_id.decode("utf-8")
await self.store.store_room(
room_id=gen_room_id,
room_creator_user_id=creator_id,
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 8feba8c90a..5ec36f591d 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -642,7 +642,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
async def send_membership_event(
self,
- requester: Requester,
+ requester: Optional[Requester],
event: EventBase,
context: EventContext,
ratelimit: bool = True,
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index bfe2583002..260ec19b41 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -87,7 +87,7 @@ class SyncConfig:
class TimelineBatch:
prev_batch = attr.ib(type=StreamToken)
events = attr.ib(type=List[EventBase])
- limited = attr.ib(bool)
+ limited = attr.ib(type=bool)
def __bool__(self) -> bool:
"""Make the result appear empty if there are no updates. This is used
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