Function try_unary_to_series 

pub fn try_unary_to_series<T, F>(
    ca: &ChunkedArray<T>,
    op: F,
) -> Result<Series, PolarsError>
where
    T: PolarsDataType,
    F: FnMut(&<T as PolarsDataType>::Array) -> Result<Box<dyn Array>, PolarsError>,