(1) In this section, "power of appointment created by the powerholder" includes a power of appointment created in a transfer by another person to the extent the powerholder contributed value to the transfer.

(2) Appointive property subject to a general power of appointment created by the powerholder is subject to a claim of a creditor of the powerholder or of the powerholder's estate to the extent provided in chapter 19.40 RCW.

(3) Subject to subsection (2) of this section, appointive property subject to a general power of appointment created by the powerholder is not subject to a claim of a creditor of the powerholder or the powerholder's estate to the extent the powerholder irrevocably appointed the property in favor of a person other than the powerholder or the powerholder's estate.

(4) Subject to subsections (2) and (3) of this section, and notwithstanding the presence of a spendthrift provision or whether the claim arose before or after the creation of the power of appointment, appointive property subject to a general power of appointment created by the powerholder is subject to a claim of a creditor of:

(a) The powerholder, to the same extent as if the powerholder owned the appointive property, if the power is presently exercisable; and

(b) The powerholder's estate, to the extent the estate is insufficient to satisfy the claim and subject to the right of a decedent to direct the source from which liabilities are paid, if the power is exercisable at the powerholder's death.