Can't conditionally update custom mapped list of strings with empty value #335

@Model()
class MyModel {
 @Property({ mapper: stringArrayOrEmptyMapper })
 myList: string[]
}
export const stringArrayOrEmptyMapper: MapperForType<
 string[],
 ListAttribute<StringAttribute>
> = {
 fromDb: attributeValue =>
 attributeValue?.L?.map((item: { S: string }) => item.S) ?? [],
 toDb: propertyValue =>
 propertyValue?.length
 ? { L: propertyValue.map(item => ({ S: item })) }
 : { L: [] },
};

new TransactUpdate(MyModel, PK, SK)
 .onlyIfAttribute('myList')
 .eq([])
 .updateAttribute('myList)
 .set(['liststuff'])