Oh, I failed to remember there was Object.freeze(). This is something the interpreter(Just-in-time compiler, to be more exact) would utilize as hints. but does

Oh, I failed to remember there was Object.freeze(). This is something the interpreter(Just-in-time compiler, to be more exact) would utilize as hints. but does this mean Immutable.js does Object.freeze()? and if so, why do we need a new library that does the same thing?