diff --git a/nwb_linkml/tests/test_io/test_io_nwb.py b/nwb_linkml/tests/test_io/test_io_nwb.py
index b91c64f..88cded3 100644
--- a/nwb_linkml/tests/test_io/test_io_nwb.py
+++ b/nwb_linkml/tests/test_io/test_io_nwb.py
@@ -73,8 +73,14 @@ def test_nwbfile_dump(read_nwbfile):
     electrodes = read_nwbfile.general.extracellular_ephys.electrodes.model_dump_json(
         round_trip=True
     )
+    data = read_nwbfile.general.model_dump_json(round_trip=True)
+
+    file = read_nwbfile.model_dump_json(
+        round_trip=True, exclude_none=True, exclude_unset=True, exclude_defaults=True
+    )
+
     # data = read_nwbfile.model_dump_json(round_trip=True, serialize_as_any=True)
-    # pdb.set_trace()
+    pdb.set_trace()
 
 
 def test_timeseries(read_nwbfile, read_pynwb):
diff --git a/nwb_models/src/nwb_models/models/pydantic/core/v2_7_0/core_nwb_base.py b/nwb_models/src/nwb_models/models/pydantic/core/v2_7_0/core_nwb_base.py
index 6c8a7fb..408a7e2 100644
--- a/nwb_models/src/nwb_models/models/pydantic/core/v2_7_0/core_nwb_base.py
+++ b/nwb_models/src/nwb_models/models/pydantic/core/v2_7_0/core_nwb_base.py
@@ -17,10 +17,10 @@ from typing import (
     Optional,
     Tuple,
     Type,
-    TypeVar,
     Union,
     overload,
 )
+from typing_extensions import TypeVar
 
 import numpy as np
 from numpydantic import NDArray, Shape
@@ -154,7 +154,7 @@ class LinkMLMeta(RootModel):
 
 NUMPYDANTIC_VERSION = "1.2.1"
 
-T = TypeVar("T", bound=NDArray)
+T = TypeVar("T", default=NDArray)
 
 
 class VectorDataMixin(ConfiguredBaseModel, Generic[T]):
@@ -364,7 +364,7 @@ class TimeSeriesReferenceVectorData(TimeSeriesReferenceVectorDataMixin, VectorDa
         description="""Number of data samples available in this time series, during this epoch""",
         json_schema_extra={"linkml_meta": {"array": {"exact_number_dimensions": 1}}},
     )
-    timeseries: NDArray[Shape["*"], TimeSeries] = Field(
+    timeseries: List[TimeSeries] = Field(
         ...,
         description="""The TimeSeries that this index applies to""",
         json_schema_extra={"linkml_meta": {"array": {"exact_number_dimensions": 1}}},