Method toreadonly

crates/vm/src/builtins/memory.rs:733–738

(&self, vm: &VirtualMachine)

    #[pymethod]
    fn toreadonly(&self, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
        self.try_not_released(vm)?;
        let mut other = self.new_view();
        other.desc.readonly = true;
        Ok(other.into_ref(&vm.ctx))
    }

    #[pymethod]
    fn hex(