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If a user is unlucky enough to interrupt R, such as by pressing CTRL-C, while Filehash is writing metrics into a dictionary, they have to clean up stray lockfiles and possibly deal with a corrupted dictionary file.
This could be easy to solve, see the following thread on R-devel:
If the solution proposed there does not work, there is probably nothing we can do.
Merge branch 'bugfix/filehash-interrupts'