diff --git a/telethon/_client/chats.py b/telethon/_client/chats.py
index 205113d6..221a420a 100644
--- a/telethon/_client/chats.py
+++ b/telethon/_client/chats.py
@@ -374,7 +374,7 @@ class _ProfilePhotoIter(requestiter.RequestIter):
 def get_participants(
         self: 'TelegramClient',
         entity: 'hints.EntityLike',
-        limit: float = None,
+        limit: float = (),
         *,
         search: str = '',
         filter: '_tl.TypeChannelParticipantsFilter' = None) -> _ParticipantsIter:
@@ -390,7 +390,7 @@ def get_participants(
 def get_admin_log(
         self: 'TelegramClient',
         entity: 'hints.EntityLike',
-        limit: float = None,
+        limit: float = (),
         *,
         max_id: int = 0,
         min_id: int = 0,
@@ -440,7 +440,7 @@ def get_admin_log(
 def get_profile_photos(
         self: 'TelegramClient',
         entity: 'hints.EntityLike',
-        limit: int = None,
+        limit: int = (),
         *,
         offset: int = 0,
         max_id: int = 0) -> _ProfilePhotoIter:
diff --git a/telethon/_client/dialogs.py b/telethon/_client/dialogs.py
index 444a0570..2ee272fe 100644
--- a/telethon/_client/dialogs.py
+++ b/telethon/_client/dialogs.py
@@ -138,7 +138,7 @@ class _DraftsIter(requestiter.RequestIter):
 
 def get_dialogs(
         self: 'TelegramClient',
-        limit: float = None,
+        limit: float = (),
         *,
         offset_date: 'hints.DateLike' = None,
         offset_id: int = 0,
diff --git a/telethon/_client/downloads.py b/telethon/_client/downloads.py
index 50a383dd..1f340982 100644
--- a/telethon/_client/downloads.py
+++ b/telethon/_client/downloads.py
@@ -407,7 +407,7 @@ def iter_download(
         *,
         offset: int = 0,
         stride: int = None,
-        limit: int = None,
+        limit: int = (),
         chunk_size: int = None,
         request_size: int = MAX_CHUNK_SIZE,
         file_size: int = None,
diff --git a/telethon/_client/messages.py b/telethon/_client/messages.py
index 66d3512e..ad4324d7 100644
--- a/telethon/_client/messages.py
+++ b/telethon/_client/messages.py
@@ -329,7 +329,7 @@ async def _get_peer(self: 'TelegramClient', input_peer: 'hints.EntityLike'):
 def get_messages(
         self: 'TelegramClient',
         entity: 'hints.EntityLike',
-        limit: float = None,
+        limit: float = (),
         *,
         offset_date: 'hints.DateLike' = None,
         offset_id: int = 0,