Writing results of polygon query as Zarr

[SFD5311]

When attempting to write a subset of a spatialdata object, produced using the polygon_query functionality to disk using the write function, I encountered the following JSON serialization error.

Traceback (most recent call last): [31/1042]
File "/opt/format_conversion.py", line 188, in
main(args.assay, args.data_directory)
File "/opt/format_conversion.py", line 143, in main
sdata.write(XENIUM_ZARR_PATH)
File "/usr/local/lib/python3.10/dist-packages/spatialdata/_core/spatialdata.py", line 1219, in write
self._write_element(
File "/usr/local/lib/python3.10/dist-packages/spatialdata/_core/spatialdata.py", line 1267
, in _write_element
write_points(points=element, group=element_type_group, name=element_name, format=parsed["points"])
File "/usr/local/lib/python3.10/dist-packages/spatialdata/_io/io_points.py", line 73, in w
rite_points
points.to_parquet(path)
File "/usr/local/lib/python3.10/dist-packages/dask/dataframe/core.py", line 5646, in to_pa
rquet
return to_parquet(self, path, *args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/dask/dataframe/io/parquet/core.py", line 952
, in to_parquet
i_offset, fmd, metadata_file_exists, extra_write_kwargs = engine.initialize_write(
File "/usr/local/lib/python3.10/dist-packages/dask/dataframe/io/parquet/arrow.py", line 72
4, in initialize_write
inferred_schema = pyarrow_schema_dispatch( [8/1042]
File "/usr/local/lib/python3.10/dist-packages/dask/utils.py", line 772, in call
return meth(arg, *args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/dask/dataframe/backends.py", line 216, in ge
t_pyarrow_schema_pandas
return pa.Schema.from_pandas(obj, preserve_index=preserve_index)
File "pyarrow/types.pxi", line 3148, in pyarrow.lib.Schema.from_pandas
File "/usr/local/lib/python3.10/dist-packages/pyarrow/pandas_compat.py", line 580, in data
frame_to_types
metadata = construct_metadata(
File "/usr/local/lib/python3.10/dist-packages/pyarrow/pandas_compat.py", line 281, in cons
truct_metadata
b'pandas': json.dumps({
File "/usr/lib/python3.10/json/init.py", line 231, in dumps
return _default_encoder.encode(obj)
File "/usr/lib/python3.10/json/encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib/python3.10/json/encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "/usr/lib/python3.10/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.class.name} '
TypeError: Object of type Scale is not JSON serializable