export function assign_defined(target, source) {
	Object.assign(target, Object.fromEntries(Object.entries(source).filter(([k ,v]) => v !== undefined )));
}


export function assign_using_predicate(target, source, kv_predicate) {
	Object.assign(target, Object.fromEntries(Object.entries(source).filter(kv_predicate)));	// Call predicate with ([k, v])
}