SceneJS incorrect determines if config is fixed or not

Other javascript libraries that modify the object prototype cause SceneJS to think {example:"value"} contains functions and therefore SceneJS._utils.getNodeConfig() sets results.fixed to false and even a simple scene throws 'Dynamic configuration of SceneJS.scene node is not supported'

Solution:

SceneJS._utils.getNodeConfig() [line:209-ish] change:

for (var key in arg) {

if (result.fixed && arg[key] instanceof Function) {
    result.fixed = false;
}

}

to:

for (var key in arg) {

if (arg.hasOwnProperty(key)) {
    if (result.fixed && arg[key] instanceof Function) {
        result.fixed = false;
    }
}

}