I have some package tests that tripped up do to double precision checks on CRAN (the last bullet point of sec 1.6 on https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Writing-portable-packages). I'd like to check that my fixes are working as expected and safeguard against this in future iterations, but don't have a ready image of R built without long-double support. None of the rocker-org Docker images look to be built this way. Has anyone done the work to create such a container image (or a Vagrant box, for that matter)?
I'd be happy with local testing, though I'd ideally like to add this to my build matrix on Travis for more long term testing.