Method count

crates/vm/src/builtins/str.rs:1281–1285

(&self, args: FindArgs)

    #[pymethod]
    fn count(&self, args: FindArgs) -> usize {
        let (needle, range) = args.get_value(self.len());
        self.as_wtf8()
            .py_count(needle.as_wtf8(), range, |h, n| h.find_iter(n).count())
    }

    #[pymethod]
    fn zfill(&self, width: isize) -> Wtf8Buf {