Performance / internals
data.table and Rcpp C++
kernels, removing the runtime dependencies on dplyr, magrittr, and
rlang.cpp_weighted_mean, cpp_rev_cumsum_by_group, cpp_fdtr_wtilde2, and
cpp_feS_delta for the per-row group computations that previously used
dplyr::group_by() + dplyr::lead() / dplyr::lag().Internals