[0.13] Inserter's Filter prioritizing over Circuits

[MindChanger]

While working on supply loader I noticed something annoying. While unloading wagon filter inserter (purple one) is getting items randomly (or last in magazine, don't know).
My algorithm was designed to prevent inserters getting stuck by unloading same filter that stack inserter has (as it has only one). Stack inserter gets first signal, so I should unload items with first signal first, but there is no prioritizing for signal order, so purple inserter gets random or last items.
I think signal order for unloading would fix my issue and maybe prevent some in the future.