Method lower

crates/vm/src/builtins/str.rs:696–702

(&self)

    #[pymethod]
    fn lower(&self) -> Self {
        match self.as_str_kind() {
            PyKindStr::Ascii(s) => s.to_ascii_lowercase().into(),
            PyKindStr::Utf8(s) => s.to_lowercase().into(),
            PyKindStr::Wtf8(w) => w.to_lowercase().into(),
        }
    }

    // casefold is much more aggressive than lower
    #[pymethod]