On the subject of low? and upp?, how does picolisp know if a character is
upper or lower case?
Is there a list of all upper and lower case characters built in to the
interpreter, and the character is checked against that list?
Or is casing information is built into unicode?

On Sat, Jun 17, 2017 at 6:19 AM, Alexander Burger <a...@software-lab.de>

> Hi Geo,
> On Sat, Jun 17, 2017 at 06:07:16AM +0000, George Orais wrote:
> > (de singleLetter? (item)   (and (=1 (length item)) (or (low? item) (upp?
> item))))
> Yes, 'low?' and "upp?" are a good idea. They do however return true also
> for
> letters like "ä" / "Ä", so it depends on what the exact task is

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