code: function sequence(inst, elems, argv, event, fin) {
      if (elems.length < 1) return fin(null, elems);
      // Running a sequence also costs some amount per element to sequence
      if (!ok(inst, inst.options.sequenceTransaction * elems.length)) {
          return exit(inst, list, fin);
      }
      return parallel(inst, elems, argv, event, fin, postSequence);
  }
docs: Get values for each list element. Subproc any elements that are lists