ext4 is currently unusable with most non-English languages

ext4-unusable.py

# https://eclecticlight.co/2017/04/06/apfs-is-currently-unusable-with-most-non-english-languages/
# ↑ is bullshit

In [1]: e = 'é'

In [2]: len(e)
Out[2]: 1

In [3]: import unicodedata

In [4]: unicodedata.name(e)
Out[4]: 'LATIN SMALL LETTER E WITH ACUTE'

In [5]: c = 'caf' + e + '.txt'

In [8]: c2 = unicodedata.normalize('NFD', c)

In [9]: len(c)
Out[9]: 8

In [10]: len(c2)
Out[10]: 9

In [11]: import os

In [12]: os.mkdir(c)

In [13]: os.mkdir(c2)

In [14]: !ls -1
bin
café.txt
café.txt
Desktop
# […omitted for brevity…]

In [15]: !uname -a
Linux kw-arch 4.11.3-1-ARCH #1 SMP PREEMPT Sun May 28 10:40:17 CEST 2017 x86_64 GNU/Linux

In [16]: !mount
/dev/sda1 on / type ext4 (rw,relatime,data=ordered)

# And now, for some extra fun:

In [19]: os.mkdir(c)
---------------------------------------------------------------------------
FileExistsError                           Traceback (most recent call last)
<ipython-input-19-8fc16ec24216> in <module>()
----> 1 os.mkdir(c)

FileExistsError: [Errno 17] File exists: 'café.txt'