Am 23.04.2018 um 14:21 schrieb David Kastrup:

Huh.  I'd rather have #f stand for the default, and '() for none.  That
seems like a saner interface since an empty list carries obvious
meaning.

Not backwards-compatible but I think this one has not been released in a
stable release yet.


But it has been part of the development tree for about 16 months ... If we would also have the type 
"none" and maybe "all", nobody would care about the meaning of '().

Knut



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