Besides the great features in the interface between the X and R languages, ongoing support is of utmost importance.
RSPerl may be built at some point in time, but there is a slight chance that it no longer works. In your situation, Perl did not know the major changes in recent years, but R certainly did.
[Disclaimer: I am very involved in rpy2, and over ~ 3 years of existence, the code base has required several changes due to changes in R and Python - in fact, I have not completely left the forest with Python 3]
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