[jhgg]

Love your work on Immutable.JS.

When I was typing out the original reply, I meant to say "Don't use Immutable.JS for small objects" but ended up putting a period in the middle... which could have led to some confusion. I've edited it to make it more clear.

We've also had some perf issues with using Immutable JS for even larger arrays. I think paying the cost of shallow copying the entire array when modifying it ended up winning in the long run as our render functions could loop over the array much faster.