diff --git a/src/zarr/core/dtype/npy/common.py b/src/zarr/core/dtype/npy/common.py
index 264561f25c..67644449a0 100644
--- a/src/zarr/core/dtype/npy/common.py
+++ b/src/zarr/core/dtype/npy/common.py
@@ -384,9 +384,7 @@ def check_json_float_v2(data: JSON) -> TypeGuard[JSONFloatV2]:
     Bool
         True if the data is a float, False otherwise.
     """
-    if data == "NaN" or data == "Infinity" or data == "-Infinity":
-        return True
-    return isinstance(data, float | int)
+    return data in ("NaN", "Infinity", "-Infinity") or isinstance(data, float | int)
 
 
 def check_json_float_v3(data: JSON) -> TypeGuard[JSONFloatV3]: