Next to the release code, a subversion number is written in the file now. This is in the chunk GLOB, which is now in beginning of file. Subversions can be used to have finer control over do_versions(), so you don't have to wait for a release to patch stuff nicely. We can also increase these subversions regularly to denote important changes. If a subversion is not 0, it's being printed in the header, so a user can also verify the state. (We might even tag cvs for it?). Next to this, a minimum version and subversion number are written too. From now on, if you change files in a way a past binary cannot read this nicely anymore, you should set these minima to the current version. This was especially added for the new mesh layers, which will not work for older binaries once we make 2.43.
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