Fix: unneccesary warning during async check

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pyrate-limiter"
-version = "3.4.0"
+version = "3.4.1"
 description = "Python Rate-Limiter using Leaky-Bucket Algorithm"
 authors = ["vutr <me@vutr.io>"]
 license = "MIT"

pyrate_limiter/abstracts/bucket.py

@@ -7,6 +7,7 @@
 from abc import abstractmethod
 from collections import defaultdict
 from inspect import isawaitable
+from inspect import iscoroutine
 from threading import Thread
 from typing import Awaitable
 from typing import Dict
@@ -130,7 +131,10 @@ def register(self, bucket: AbstractBucket, clock: AbstractClock):
         assert self.clocks is not None
         assert self.async_buckets is not None
 
-        if isawaitable(bucket.leak(0)):
+        try_leak = bucket.leak(0)
+
+        if iscoroutine(try_leak):
+            try_leak.close()
             self.async_buckets[id(bucket)] = bucket
         else:
             self.sync_buckets[id(bucket)] = bucket