I can be merged now.

[mstackhouse]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[mstackhouse]

Only these files need to be reviewed:

• [ ] https://github.com/atorus-research/Tplyr/pull/163/files#diff-b1d304bc2e54816287509e162617e7843839f88f79045d41b85802a7ac474b9d
• [ ] https://github.com/atorus-research/Tplyr/pull/163/files#diff-850aa2dd10723b0c29f075c2acf08b0631058db0f18028dfe34d2cf2cb60c3ec
• [ ] https://github.com/atorus-research/Tplyr/pull/163/files#diff-cd0be89dd65e80434332204a0f3469519558d136a80b08507869de35c67ca9f7

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1f26ff6) 92.52% compared to head (5e5d244) 92.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #163 +/- ## ======================================= Coverage 92.52% 92.52% ======================================= Files 43 43 Lines 2784 2784 ======================================= Hits 2576 2576 Misses 208 208 ```

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