Cannot sync Tabulator.value to url - DataFrame is not JSON serializable

[MarcSkovMadsen]

In Panel 1.4.2 we added support for syncing DataFrame parameters to the url.

This works fine for simple Parameterized classes. But for the Tabulator value parameter it does not.

Please add support for syncing dataframe parameters of widgets and panes in general.

import panel as pn
import pandas as pd
import param

pn.extension("tabulator")

data = pd.DataFrame({"x": [1], "y": [2]})

table = pn.widgets.Tabulator(data)

# class Table(param.Parameterized):
#     value = param.DataFrame()

# table = Table(value=data)

pn.state.location.sync(table, parameters=["value"])

pn.template.FastListTemplate(
    title="Sync a DataFrame and the url parameters",
    main=[table]
).servable()

TypeError: Object of type DataFrame is not JSON serializable

Traceback (most recent call last):
  File "C:\repos\private\panel\.venv\Lib\site-packages\panel\io\handlers.py", line 389, in run
    exec(self._code, module.__dict__)
  File "C:\repos\private\panel\script.py", line 16, in <module>
    pn.state.location.sync(table, parameters=["value"])
  File "C:\repos\private\panel\.venv\Lib\site-packages\panel\io\location.py", line 251, in sync
    v = json.dumps(v)
        ^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\json\__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\json\encoder.py", line 200, in encode
    chunks = self.iterencode(o, _one_shot=True)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\json\encoder.py", line 258, in iterencode
    return _iterencode(o, 0)
           ^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\json\encoder.py", line 180, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type DataFrame is not JSON serializable