Function skip_initial_space 

pub fn skip_initial_space(
    lf: LazyFrame,
    nulls: impl Fn(&str) -> Vec<String>,
) -> PolarsResult<LazyFrame>

skipInitialSpace: the spaces after a delimiter are not part of a text value, so " 152.6" is "152.6" and a cell of spaces is empty, which reads as null like an empty cell. nulls are the null values this column takes, matched after the padding is gone, as they would be against the unpadded file.