Mapper Device shouldn't require "write", "read" or "bind"

[thibaudk]

in this example

import Ossia 1.0 as Ossia

Ossia.Mapper
{
    function createTree() {
        return [
        {
            name: "Branch",
            type: Ossia.Type.Int,
            write: function(v) { return v.value; }
        }
        ];
    }
}

the write function is useless, but required to create a simple "Branch" parameter. otherwise it is instantiated as an empty node

[jcelerier]

how's this issue with the latest work that was done ?