Coffeescript allows you to create classes whose methods are automatically bound to the correct this. You can do this by using a fat arrow:

class Person

  constructor: (name) ->
    @name = name

  sayHello: =>
    alert("Hello, I am #{@name}")

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An important caveat is that when you clone such an object, all of its methods are still bound to the original instance:

eve = new Person("Eve")
eve.sayHello() # => "Hello, I am Eve"
bob = _.clone(eve)
bob.name = "Bob"
bob.sayHello() # => "Hello, I am Eve"

I don't think there is a workaround for this, you simply cannot clone instances of Coffeescript instances as you would clone other Javascript hashes. If you need cloning, you would probably need to implement a clone() method in your class, which constructs the clone instance using new.