if (requireNamespace("microbenchmark")) {
  microbenchmark::microbenchmark(
    icd:::icd9ChildrenShort(c("001", 100:500), onlyReal = TRUE),
    icd:::icd9ChildrenShort_alt11(c("001", 100:500), onlyReal = TRUE),
    times = 5
  )
  # C++11 about 15% faster for this data
}

microbenchmark(icd9ChildrenShort("001", T), icd9ChildrenShortStd("001", T), times = 100)
microbenchmark(icd9ChildrenShort(c("001", 100:400), T),
  icd9ChildrenShortUnordered(c("001", 100:400), T),
  icd9ChildrenShortStd(c("001", 100:400), T),
  times = 10
)
# }
#' # un-ordered set much faster, but may still need to sort result
