(a) Community-property spouses domiciled in this State may partition or reclassify property to which this Article otherwise would apply. The partition or reclassification must be in a record signed by both community-property spouses. Unless both community-property spouses agree otherwise, partition of community property is presumed to result in each spouse owning a one-half separate property interest in each item of property addressed in the record.
(b) A community-property spouse domiciled in this State may waive a right granted by this Article only by complying with the law of this State, including this State's choice-of-law rules, applicable to waiver of a spousal property right.