Straight from the horse's mouth, Apple's HFS Plus volumes do indeed
support NULs in file names. Quote:
Indirect node files exist in a special directory called the
metadata directory. This directory exists in the volume's root
directory. The name of the metadata directory is four null
characters followed by the string "HFS+ Private Data".
and:
The case-insensitive Unicode string comparison used by
HFS Plus and case-insensitive HFSX sorts null characters
after all other characters, so the metadata directory
will typically be the last item in the root directory.
On case-sensitive HFSX volumes, null characters sort
before other characters, so the metadata directory will
typically be the first item in the root directory.
https://developer.apple.com/library/archive/technotes/tn/tn1150.html#HFSPlusNames
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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