vtreat version 1.5.2 just became available from CRAN.
We have a logged a few improvement in the NEWS. The changes are small and incremental, as the package is already in a great stable state for production use.
One of the biggest improvements is documentation clean up, and adapting the examples to use wrapr unpack/to multiple assignment notation. An example of the new documentation can be found here, and the larger tutorials are here.
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Data Scientist and trainer at Win Vector LLC. One of the authors of Practical Data Science with R.