Re: append, push, and add-to-list.

[Drew Adams]

> But with '() you see that it is (an empty) list:
> 
>   (defvar lst)
>   (setq lst '())

Yes, for human reading, () suggests that the
value might be used as a list, and nil suggests
that it might not be (e.g., it might be used as
a truth value or otherwise).

But there is no reason to quote ().  Like t,
() is evaluates to itself.

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