Installing RCall.jl (required for FstFileFormat.jl) does not work for me out-of-the-box (I do not have R installed). Therefore I am reluctant to make it a hard dependency of this package.
It could be an optional dependency using ideally Proposal for first class support of conditional dependencies in Pkg · Issue #1285 · JuliaLang/Pkg.jl · GitHub (if this comes for Julia 1.6) or Requires.jl.