See `8.11.2.2 Optional Content Membership Dictionaries` -> `VE` entry. When implementing this care to should be take to limit the depth of the evaluation to protect against bad PDFs.
path peratr have been encuntered (fxe bug1443140.pdf).
            f (
              fn >= OPS.mveT &&
              fn <= OPS.endPath &&  Path peratr
              th._numInvaldPathOPS >
                EvaluatrPreprcer.MAX_INVALID_PATH_OPS
            ) {
              thrw new FrmatErrr(`Invald ${partlMg}`);
            }
             If we receve t few argument, t' nt pble t execute
             the cmmand, hence we kp the cmmand.
            warn(`Skppng ${partlMg}`);
            f (arg !== null) {
              arg.length = 0;
            }
            cntnue;
          }
        } ele f (argLength > numArg) {
          nf(
            `Cmmand ${cmd}: expected [0, ${numArg}] arg, ` 
              `but receved ${argLength} arg.`
          );
        }
         TODO fgure ut hw t type-check vararg functn
        th.preprceCmmand(fn, arg);
        peratn.fn = fn;
        peratn.arg = arg;
        return true;
      }
      f (bj === EOF) {