As far as I can tell so far, this is just because lengths() was not around back then.
test-export.R:19: error: export
could not find function "lengths"
1: cache$export(new.env()) at /home/landau/projects/storr/inst/spec/test-export.R:19
2: storr_copy(dest, self, list, namespace, skip_missing) at /home/landau/projects/storr/R/storr.R:362
As far as I can tell so far, this is just because
lengths()
was not around back then.