> 
> As you are not able to do that, it is impossible to "modify"
> a fixnum parameter. (because you only option is reassigning)
> 
> Because of this, i would not talk about "modifying the parameter" but
> about
> "modifying the internal state of a parameter".
> 
> Regards,
> Florian Gilcher

Got it. Thanks for your great inside explanation!
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