From 61fe759778f7ca3b9425ca3fc1d54221466f69ab Mon Sep 17 00:00:00 2001
From: Davis Vann Bennett <davis.v.bennett@gmail.com>
Date: Fri, 6 Dec 2024 16:02:23 +0100
Subject: [PATCH] make type hint accurate

---
 xarray/backends/zarr.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/backends/zarr.py b/xarray/backends/zarr.py
index 8b83f2b755d..b3d2d3af413 100644
--- a/xarray/backends/zarr.py
+++ b/xarray/backends/zarr.py
@@ -750,7 +750,7 @@ def __init__(
         self._close_store_on_close = close_store_on_close
         self._use_zarr_fill_value_as_mask = use_zarr_fill_value_as_mask
 
-        self._cache: dict[str, tuple[str, ...]] = {}
+        self._cache: dict[str, None | tuple[str, ...]] = {}
         if cache_array_keys:
             self._cache["array_keys"] = None