From 3b0a865a7736713910b19da90f625bfa5d2a7f64 Mon Sep 17 00:00:00 2001
From: Janice Kim <janice.kim@noaa.gov>
Date: Wed, 22 Oct 2025 09:33:45 -0400
Subject: [PATCH] type fix: tuple to list

---
 pyfv3/_config.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pyfv3/_config.py b/pyfv3/_config.py
index e037493c..2ef6fbe5 100644
--- a/pyfv3/_config.py
+++ b/pyfv3/_config.py
@@ -319,7 +319,8 @@ def from_f90nml(
                 use when initializing the DynamicalCoreConfig. If None, all
                 groups will be used. (Default: DEFAULT_DYCORE_NML_GROUPS)
         """
-        nml_dict = f90nml_as_dict(nml, flatten=True, target_groups=target_groups)
+        groups = list(target_groups) if target_groups is not None else None
+        nml_dict = f90nml_as_dict(nml, flatten=True, target_groups=groups)
         nml_dict["target_nml_groups"] = target_groups
         return cls.from_dict(nml_dict)