Function pydict_to_params 

pub fn pydict_to_params(
    py: Python<'_>,
    dict: &Py<PyDict>,
) -> PyResult<Option<Params>>

Converts a Python dict to Params (IndexMap<String, Value>).

An empty dict canonicalizes to None, distinguishing “no params provided” from a populated map. This is not the inverse of params_to_pydict, which accepts &Params (not Option<&Params>); callers handle the outer option.

Integer values must fit signed or unsigned 64-bit integers, including in nested containers.

Errors

Returns an error if:

• The dict cannot be serialized to JSON.
• The JSON is not a valid object.
• An integer value is outside the signed or unsigned 64-bit range (ValueError).