[Python] Pandas to polars fails

I am getting data from DBnomics which returns it as pandas df. I prefer polars, and so do pl.from_pandas(df) and that sometimes fails with TypeError: 'float' object cannot be converted to 'PyString'

here is the code

import pandas as pd
from dbnomics import fetch_series
import polars as pl
df= fetch_series("WB/WDI/A-NY.GDP.MKTP.CD-RUS")
df = pl.from_pandas(df)


I could fix it in this specific case, but is there a way to robustly convert pandas to polars?

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