Rubocop replaces the default YAML library which makes development
testing difficult. It does not cause problems on Travis, but according
to reports, it does cause instability with many individual dev
environments.
While I would love to have a more solid source of this bug report, right
now this was an oral report from @shuckins-r7 (who I tend to believe a
lot).
This is a work in progress because the code base is old and the style
varies wildly, however .rubocop.yml can (and should) be tweaked over
time to change standards as we see fit. As it stands right now there
are few (if any) modules that pass Rubocop.