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And change Py None conversion so it converts to JS undefined.

The semantics for conversion of these objects are then:
- Python None           -> JavaScript undefined
- JavaScript undefined  -> Python None
- JavaScript null       -> Python None

This follows Pyodide:
https://pyodide.org/en/stable/usage/type-conversions.htmlSigned-off-by: Damien George <damien@micropython.org>