Generator bind breaks argument passing

[basickarl]

var genbind = require('generator-bind');
function* myGen(i) {
    console.log('myGen',this.x, i);
}
//myGen = genbind({x:666}, myGen);
myGen(9).next();

The code above echos myGen undefined 9 as expected.

var genbind = require('generator-bind');
function* myGen(i) {
    console.log('myGen',this.x, i);
}
myGen = genbind({x:666}, myGen);
myGen(9).next();

The code above echos myGen 666 undefined, I was expecting myGen 666 9.

I'm wondering if I'm using this module incorrectly?