Hi Christophe,

> Is there somewhere some info about "" being NIL?

   http://software-lab.de/doc/ref.html#nilSym
      ...
       • to represent a string of length zero
      ...

   http://software-lab.de/doc/ref.html#nilSym-io

      Besides for standard normal form, NIL is also recognized as (), [] or ""


> I'd like to know why, maybe with some historical hindsight,

There is no special history to it.


> The language I'm trying to embed in PicoLisp would love to have
> "" and NIL different !

Why? I believe this is a wonderful feature! A lot of PicoLisp's
expressive power is a result of this universality of NIL.

♪♫ Alex
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