src/js/vatperiod.js
function VATPeriod(effectiveFrom, superReduced, reduced, standard, parking) {
  this._effectiveFrom = effectiveFrom;
  this._superReduced = superReduced;
  this._reduced = reduced;
  this._standard = standard;
  this._parking = parking;
}
function VATPeriod(effectiveFrom, superReduced, reduced, standard, parking) {
  this._effectiveFrom = effectiveFrom;
  this._superReduced = superReduced;
  this._reduced = reduced;
  this._standard = standard;
  this._parking = parking;
}
VATPeriod

@param {Date} effectiveFrom
@param {number|undefined} [superReduced]
@param {array|undefined} [reduced]
@param {number|undefined} [standard]
@param {number|undefined} [parking]