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Re:Programming R at native speed using Haskell by rfergie on Wednesday September 09, 2015 @06:23AM (#10190633)
https://tweag.github.io/HaskellR/docs/managing-memory.html

https://tweag.github.io/HaskellR/docs/memory-allocation.html

Both these links have more information on this.

As far as I can tell (and most of this is way over my head) the native R garbage collection is used

Re:Programming R at native speed using Haskell by mboes on Wednesday September 09, 2015 @07:49AM (#10190848)
Yes - the R GC manages R objects allocated by the R interpreter, and conversely the Haskell GC manages Haskell objects allocated by the Haskell runtime.