Tools to Work with the 'Splash' JavaScript Rendering Service in R
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  1. `%l0%` <- function(x, y) if (length(x) == 0) y else x
  2. `%||%` <- function(x, y) if (is.null(x)) y else x
  3. `%@%` <- function(x, name) attr(x, name, exact = TRUE)
  4. `%nin%` <- function(x, table) match(x, table, nomatch = 0) == 0