Method zfill

crates/vm/src/builtins/str.rs:1288–1293

(&self, width: isize)

    #[pymethod]
    fn zfill(&self, width: isize) -> Wtf8Buf {
        unsafe {
            // SAFETY: this is safe-guaranteed because the original self.as_wtf8() is valid wtf8
            Wtf8Buf::from_bytes_unchecked(self.as_wtf8().py_zfill(width))
        }
    }

    #[inline]
    fn _pad(