zach resquest fix test

Author: h-mayorquin

src/spikeinterface/core/tests/test_unitsaggregationsorting.py

@@ -34,12 +34,10 @@ def test_unitsaggregationsorting(create_cache_folder):
         spiketrain1_1 = sorting1.get_unit_spike_train(unit_ids[1], segment_index=seg)
         spiketrains2_0 = sorting2.get_unit_spike_train(unit_ids[0], segment_index=seg)
         spiketrains3_2 = sorting3.get_unit_spike_train(unit_ids[2], segment_index=seg)
-        assert np.allclose(spiketrain1_1, sorting_agg.get_unit_spike_train(str(unit_ids[1]), segment_index=seg))
+        assert np.allclose(spiketrain1_1, sorting_agg.get_unit_spike_train(unit_ids[1], segment_index=seg))
+        assert np.allclose(spiketrains2_0, sorting_agg.get_unit_spike_train(num_units + unit_ids[0], segment_index=seg))
         assert np.allclose(
-            spiketrains2_0, sorting_agg.get_unit_spike_train(str(num_units + unit_ids[0]), segment_index=seg)
-        )
-        assert np.allclose(
-            spiketrains3_2, sorting_agg.get_unit_spike_train(str(2 * num_units + unit_ids[2]), segment_index=seg)
+            spiketrains3_2, sorting_agg.get_unit_spike_train(2 * num_units + unit_ids[2], segment_index=seg)
         )
 
     # test rename units

src/spikeinterface/core/unitsaggregationsorting.py

@@ -46,7 +46,7 @@ def __init__(self, sorting_list, renamed_unit_ids=None):
             else:
                 default_unit_ids = [str(i) for i in range(num_all_units)]
                 if all_ids_are_same_type and np.issubdtype(unit_ids_dtypes[0], np.integer):
-                    unit_ids = np.arange(num_all_units, dtype=dtype)
+                    unit_ids = np.arange(num_all_units, dtype=np.uint64)
                 else:
                     unit_ids = default_unit_ids