Test environments Microsoft windows 10 Enterprise, R 3.6.0 ubuntu 14.04 (on travis-ci), R 3.6.0 win-builder (devel and release) R CMD check results 0 errors | 0 warnings | 0 notes Responding to Kurt Hornik's comments on 2020-05-19 type.convert() is always called with an explicit "as.is" argument", to comply with new rules