Immutablejs within plain objects - Monads

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The redux best practices says not to mix plain javascript object with immutablejs objects. I'm trying my hand at functional programming and it seems like the monads require the computations/values to be stored inside an object, or some container of sorts. AFAIK immutablejs maps can't store methods. Are there any issues with using FP libraries like Folktale? I haven't noticed any noticeable issues with the basic todo app (which is all I can try at the moment), so I'm hoping for some clarification on immutablejs best practices, hopefully FP leaning.

Never mix plain JavaScript objects with Immutable.JS

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jmmendez On

Ok, I feel like a fool. I read the linked article again and saw that it's not about performance, but to avoid confusion as to when data passed is immutable or a pojo. Here's the relevant section from the article

In fact, sometimes you might be tempted to put a normal JavaScript object inside an Immutable map. Don't do this. Mixing immutable and mutable state in the same object will reap confusion.

http://jlongster.com/Using-Immutable-Data-Structures-in-JavaScript