I'm using Isotope v2 & having some trouble revealing previously hidden items. I'm not sure what I'm doing wrong.

To start, I'm gathering an array of jQuery objects & telling Isotope to hide them. This works perfectly:

```
elements.postsToHide.push($(elements.gridBlock + "#" + v.SocialPostId)); // $(".block#block123")
elements.grid.isotope("hide", elements.postsToHide).isotope();

```

Eventually, I'd like to reveal these hidden items again. So, on click of a button, I'm doing the following, which does not reveal anything:

```
elements.grid.isotope("reveal", elements.postsToHide);

```

[The docs say](http://isotope.metafizzy.co/methods.html#hide) "hide" & "reveal" take and Array of Isotope.Items, which I *believe* I'm passing properly.

When I call the reveal method, my console says "Uncaught Error: undefined is not a function".

I'm perplexed as to why I can push into an array and hide items, but the same array cannot be revealed.