Made git annex export --to remote honor the preferred content of the remote. In a nice bit of code reuse, adjustTree was just what I needed to filter unwanted content out of the exported tree.

Then a hard problem: When a tree is exported with some non-preferred content filtered out, importing from the remote generates a tree that is lacking those files, but merging that tree would delete the files from the working tree. Solving that took the rest of the day.