Correct way to push to an array in a model

[Steven Githens]

Hi Fluid,

Just popping in to check on the correct way to push a value to an array using the change applier.
In the snippet below, I assume using fluid.copy is the correct way to do this, so I'm not editing the model in place outside of the change applier.

    var curUnsavedChanges = fluid.copy(that.model.unsavedChanges);
    curUnsavedChanges.push({
        description: description
    });
    that.applier.change("unsavedChanges", curUnsavedChanges);

Do we think in the future we might have a few change applier types that could deal with something like this so it's not necessary to copy the item ( even in the future where models are immutable data structures ).

So you might go like:

that.applier.change("unsavedChanges", { description: description}, "ARRAY_PUSH");

And if unsavedChanges wasn't an array it would maybe fail, complain, or just assign it if the current val is a primitive.

Cheers,
Steve