support only list (or np.ndarray) in _set_prefilter (edf, bdf return …

…highpass/lowpass of ndarray of str to _get_info. gdf returns highpass/lowpass of ndarray of np.float32 to _get_info)

mne/io/edf/edf.py

@@ -747,13 +747,8 @@ def _prefilter_float(filt):
 
 
 def _set_prefilter(info, edf_info, key):
-    if key not in edf_info:
-        return
     value = 0
-    values = edf_info[key]
-    if isinstance(values, (int, float, np.number)):
-        value = values
-    elif len(values):
+    if len(values := edf_info.get(key, [])):
         if len(np.unique(values)) > 1:
             warn(
                 f"Channels contain different {key} filters. "

mne/io/edf/tests/test_edf.py

@@ -687,11 +687,11 @@ def test_edf_prefilter_float(prefilter_string, expected):
         ({"highpass": ["0"], "lowpass": ["1.1"]}, -1, 1.1, False, False),
         ({"highpass": [""], "lowpass": [""]}, -1, -1, False, False),
         ({"highpass": ["DC"], "lowpass": [""]}, -1, -1, False, False),
+        ({"highpass": [1], "lowpass": [2]}, 1, 2, False, False),
+        ({"highpass": [np.nan], "lowpass": [np.nan]}, -1, -1, False, False),
         ({"highpass": ["1", "2"], "lowpass": ["3", "4"]}, 2, 3, True, True),
         ({"highpass": [np.nan, 1], "lowpass": ["", 3]}, 1, 3, True, True),
         ({"highpass": [np.nan, np.nan], "lowpass": [1, 2]}, -1, 1, False, True),
-        ({"highpass": 1, "lowpass": 2}, 1, 2, False, False),
-        ({"highpass": np.nan, "lowpass": np.nan}, -1, -1, False, False),
         ({}, -1, -1, False, False),
     ],
 )