Thanks for writing this Petr!

A few comments below.

On Mon, Nov 01, 2021 at 01:17:02PM +0100, Petr Viktorin wrote:

> >ASCII-only Considerations
> >-------------------------
> >
> >ASCII is a subset of Unicode
> >
> >While issues with the ASCII character set are generally well understood,
> >the're presented here to help better understanding of the non-ASCII cases.

You should mention that some very common typefaces (fonts) are more 
confusable than others. For instance, Arial (a common font on Windows 
systems) makes the two letter combination 'rn' virtually 
indistinguishable from the single letter 'm'.


> >Before the age of computers, most mechanical typewriters lacked the keys 
> >for the digits ``0`` and ``1``

I'm not sure that "most" is justifed here. One of the most popular 
typewriters in history, the Underwood #5 (from 1900 to 1920), lacked 
the 1 key but had a 0 distinct from O.

https://i1.wp.com/curiousasacathy.com/wp-content/uploads/2016/04/underwood-no-5-standard-typewriter-circa-1901.jpg

The Oliver 5 (1894 – 1928) had both a 0 and a 1, as did the 1895 Ford 
Typewriter. As did possibly the best selling typewriter in history, the 
IBM Selectric (introduced in 1961).

http://www.technocrazed.com/the-interesting-history-of-evolution-of-typewriters-photo-gallery

Perhaps you should say "many older mechanical typewriters"?


> >Bidirectional Text
> >------------------

The section on bidirectional text is interesting, because reading it in 
my email client mutt, all the examples are left to right.

You might like to note that not all applications support bidirectional 
text.


> >Unicode includes alorithms to *normalize* variants like these to a 
> >single form, and Python identifiers are normalized.

Typo: "algorithms".



This is a good and useful document, thank you again.


-- 
Steve
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