## Test environments

- local OS X install, R 4.1.0
- GitHub Actions (ubuntu-20.04): release, devel
- GitHub Actions (windows): release
- Github Actions (macOS): release
- r-hub: windows-x86_64-devel, ubuntu-gcc-release, fedora-clang-devel
- win-builder: release, devel, oldrelease

## R CMD check results

There were no ERRORS, no WARNINGS, no MESSAGES
