I just tried to install a Buster system with cdebootstrap(-static) and that fails because this bug is not fixed. According to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904699#15, increasing READSIZE from 16384 to 65536 'fixes' it.
I agree that 65536 is also just a random number, but so late in the freeze it may be warranted to do it, so cdebootstrap becomes usable for Buster. This seems RC to me, but I let it up to the maintainers to actually do that. Cheers, Diederik
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