[isabelle-dev] NEWS: Characters (type char) are modelled as finite algebraic type, corresponding to {0..255}

[Florian Haftmann]

> On Sat, 12 Mar 2016, Florian Haftmann wrote:
> 
>> * A type of infinitely many characters could serve a model for unicode
>>   characters.
> 
> Unicode has only finitely many code points. Presently, 21 bits are
> sufficient to encode that.
> 
> Does it make sense to have a char type with somewhat "unspecified" size.
> I.e. one that might change over the years, like Unicode does?

I had something similar in mind when I wrote this.  My idea would be to
have a type of infinitely many characters where only a defined (but
monotonously growing) prefix is associated with glyphs for concrete syntax.

	Florian

> 
> 
>     Makarius
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