docs: function pureFunction4(slotOffset, pureFn, exp1, exp2, exp3, exp4, thisArg) {
      ngDevMode && assertReservedSlotInitialized(slotOffset, 5);
      var index = moveBindingIndexToReservedSlot(slotOffset);
      var value = bindingUpdated4(exp1, exp2, exp3, exp4) ?
          checkAndUpdateBinding$1(thisArg ? pureFn.call(thisArg, exp1, exp2, exp3, exp4) : pureFn(exp1, exp2, exp3, exp4)) :
          consumeBinding();
      restoreBindingIndex(index);
      return value;
  }