Philip Martin <philip.mar...@wandisco.com> writes:

> 'd41d8cd98f00b204e9800998ecf8427e' is the MD5 of the empty string and
> Subversion has special handling of that checksum.

I made a mistake here.  'd41d8cd98f00b204e9800998ecf8427e' is the
checksum of the empty string:

   $ echo -n | md5sum
   d41d8cd98f00b204e9800998ecf8427e  -

but that's not the checksum that has special handling in Subversion.
The zero checksum is the checksum with special handling, it is created
by svn_checksum_create and svn_checksum_clear, it has a digest that is
all zeros, and it matches any other checksum of the same kind.

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