Yesterday, worked on cleaning up the todo list. Fixed Windows slash problem with rsync remotes. Today, more Windows work; it turns out to have been quite buggy in its handling of non-ASCII characters in filenames. Encoding stuff is never easy for me, but I eventually managed to find a way to fix that, although I think there are other filename encoding problems lurking in git-annex on Windows still to be dealt with.
Implemented an interesting metadata feature yesterday. It turns out that metadata can have metadata. Particularly, it can be useful to know when a field was last set. That was already beeing tracked, internally (to make union merging work), so I was able to quite cheaply expose it as "$field-lastchanged" metadata that can be used like any other metadata.
I've been thinking about how to implement required content expressions, and think I have a reasonably good handle on it.