message: xlate arguments now interpolates all values
diff: @@ -31,7 +31,7 @@ export function xlateArgument(value) {
  const regexp = /\$\{(.*?)\}/g
  let lastIndex = 0
  while ((r2 = regexp.exec(value))) {
  - if (variables.get(r2[1])) {
  + if (variables.has(r2[1])) {
  if (r2.index - lastIndex > 0) {
  parts.push(string(value.substring(lastIndex, r2.index)))
  }
  