File: assertions.R

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is_string <- function(x) {
  is.character(x) && length(x) == 1 && !is.na(x)
}

is_flag <- function(x) {
  is.logical(x) && length(x) == 1 && !is.na(x)
}

is_timeout <- function(x) {
  is.numeric(x) && length(x) == 1 && !is.na(x) && x >= 0
}