Method rstrip

crates/vm/src/builtins/str.rs:878–894

(
        zelf: PyRef<Self>,
        chars: OptionalOption<PyStrRef>,
        vm: &VirtualMachine,
    )

    #[pymethod]
    fn rstrip(
        zelf: PyRef<Self>,
        chars: OptionalOption<PyStrRef>,
        vm: &VirtualMachine,
    ) -> PyRef<Self> {
        let s = zelf.as_wtf8();
        let stripped = s.py_strip(
            chars,
            |s, chars| s.trim_end_matches(|c| chars.contains_code_point(c)),
            |s| s.trim_end(),
        );
        if s == stripped {
            zelf
        } else {
            vm.ctx.new_str(stripped)
        }
    }

    #[pymethod]
    fn endswith(&self, options: anystr::StartsEndsWithArgs, vm: &VirtualMachine) -> PyResult<bool> {