From 36ec6683869590a8813dfbea91ba5055172dac26 Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Thu, 24 Sep 2020 11:12:23 -0400
Subject: [PATCH] Make topics a set

---
 tractor/msg.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tractor/msg.py b/tractor/msg.py
index 41d1d6b87..0462fd0ce 100644
--- a/tractor/msg.py
+++ b/tractor/msg.py
@@ -193,7 +193,7 @@ async def _execute(
             topics: Set[str],
             *args,
             # *,
-            task_name: str = None,
+            task_name: str = None,  # default: only one task allocated
             packetizer: Callable = None,
             **kwargs,
         ):
@@ -202,6 +202,7 @@ async def _execute(
                     f"{agen} must be called with a `task_name` named "
                     f"argument with a falue from {tasks}")
 
+            topics = set(topics)
             ss = current_actor().statespace
             lockmap = ss.setdefault('_pubtask2lock', task2lock)
             lock = lockmap[task_name]