psData
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testdat integration
It looks alright, still in its infancy. The idea to have is_UTF8 or contains_NA-style functions is very good, it encourages literate programming.
Some functions might be redundant with stuff already handled by the psData S4 class. @jrnold told us that he has updated the code on which the class is currently built, so the choice might be between testdat and r-checker. There's also a possibility that both might work well together.
I believe this extends the brainstorm to three packages that we need to take into account in development: plm, r-rcheker and testdat.