Method readinto

crates/vm/src/stdlib/_io.rs:1909–1914

(&self, buf: ArgMemoryBuffer, vm: &VirtualMachine)

        #[pymethod]
        fn readinto(&self, buf: ArgMemoryBuffer, vm: &VirtualMachine) -> PyResult<Option<usize>> {
            let mut data = self.reader().lock(vm)?;
            let raw = data.check_init(vm)?;
            ensure_unclosed(raw, "readinto of closed file", vm)?;
            data.readinto_generic(buf.into(), false, vm)
        }

        #[pymethod]
        fn readinto1(&self, buf: ArgMemoryBuffer, vm: &VirtualMachine) -> PyResult<Option<usize>> {