Javascript Immutable
https://www.sitepoint.com/immutability-javascript/
http://jlongster.com/Using-Immutable-Data-Structures-in-JavaScript
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
http://wecodetheweb.com/2016/02/12/immutable-javascript-using-es6-and-beyond/
http://softwareengineering.stackexchange.com/questions/151733/if-immutable-objects-are-good-why-do-people-keep-creating-mutable-objects
http://tech.noredink.com/post/107617838018/switching-from-immutablejs-to-seamless-immutable
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