Explanation for binary files inside source package according to
  http://lists.debian.org/debian-devel/2013/09/msg00332.html

Files: tests/testthat/infrastructure/data/x.rda
       tests/testthat/testDataLazy/data/a.rda
       tests/testthat/testDataLazy/R/sysdata.rda
       tests/testthat/testData/data/a.rda
       tests/testthat/testData/R/sysdata.rda
  These files are results of previous runs of the testthat code and needed
  for comparison for the actual test suite

 -- Andreas Tille <tille@debian.org>  Wed, 10 Jan 2018 11:13:55 +0100
