Raymond Hettinger wrote:
> 
> Raymond Hettinger <rhettinger@users.sourceforge.net> added the comment:
> 
> Try not to sprawl this all over the docs.  Find the most common root and document it there.  No need to garbage-up Fractions, Decimal etc. with something that is of zero interest to 99.9% of users.

That's a good idea. It may be enough to just add a new

unicode_decimal_digit ::= ...

to the language spec (even if it is not used there) and then reference
it from the other parts of the docs.

Same for unicode_digit and unicode_numeric.