A provision in a last will and testament or trust instrument that an executor or fiduciary authorized or required by its terms to satisfy a pecuniary bequest or transfer in trust with assets in kind at their federal estate tax values or at any values other than fair market values at date of distribution or allocation shall act fairly or equitably or not arbitrarily in satisfying the bequest or transfer, shall be deemed, in the absence of clear provisions to the contrary, to be a direction to distribute or allocate assets, including cash, fairly representative, on the date of distribution or allocation, of the appreciation or depreciation in the value of all property available for distribution or allocation.