/*
   * Get value of selector by name
   * epr#selector converts any value passed to String
   *
   * ==== Shortcut
   * epr.selector("name") can also be abbreviated as epr.name
   *
   * ==== Examples
   *   epr.selector("name")
   *   epr.selector(value)
   *   epr.name
   */
  char *selector(VALUE v) {