I suspect it's GitHub's forking model that stops projects dying so easily. Launchpad seems to have a higher proportion of unmaintained code.
miniblog.
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I've been playing with https://github.com/orium/rpds as a replacement for im in difftastic, and it's a significant speedup! I saw a 30% runtime reduction in one case.
im is great but sadly seems unmaintained. I suspect its 'small vector as a vec' design doesn't suit my use case.