From 52aef92a1d44de03c84d65b3e4eeedaf40221547 Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Mon, 3 Oct 2022 15:53:09 -0700
Subject: [PATCH] Update backoff/_wait_gen.py

---
 backoff/_wait_gen.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backoff/_wait_gen.py b/backoff/_wait_gen.py
index 472fd12..84fe259 100644
--- a/backoff/_wait_gen.py
+++ b/backoff/_wait_gen.py
@@ -8,7 +8,7 @@ def expo(
     base: float = 2,
     factor: float = 1,
     max_value: Optional[float] = None
-) -> Generator[float, Any, None]:
+) -> Generator[Optional[float], Any, None]:
 
     """Generator for exponential decay.