(chore): add note

tests/test_v2.py

@@ -158,6 +158,8 @@ def test_v2_encode_decode_with_data(dtype_value, tmp_path):
 
 @pytest.mark.parametrize("dtype", [str, "str"])
 async def test_create_dtype_str(dtype: Any, tmp_path) -> None:
+    # see https://github.com/zarr-developers/zarr-python/issues/2627 for why this test
+    # is probably wrong
     arr = zarr.create(store=tmp_path, shape=3, dtype=dtype, zarr_format=2)
     assert arr.dtype.kind == "O"
     assert arr.metadata.to_dict()["dtype"] == "|O"