Staff creation and pricing order, ever officially resolved?

[ShoulderPatch]

When making a staff and determining the pricing order, is it only level of spell that factors in, or does charges required count too? Either way, where is that stated in the rules (printed or FAQ/errata/updates)?

Example, 3 spells being put in staff
Spell Level 3 spell [will use 3 charges per use]
Spell Level 3 spell [will use 2 charges per use]
Spell Level 2 spell

The spell level 2 spell has to go last, but of the spell level 3 spells, can you make the "2 charges per use" secondary to the 3 charges per use, so as to lower staff cost?

I found the two previous threads discussing this but I do not see any response from any devs (except SKR I think, who only said "don't allow costs higher than 3 per use", and I'm unsure if that was speaking opinion or for paizo), I can't find an errata or FAQ for it, nor in the most recent thread I found did there seem to be a player consensus or an answer from backmathing the pregenerated staves.

Sidequestion: Does anyon know how Herolab handles it?

[Ravingdork]

Pretty sure spell level comes first, charges later.

EDIT: Yep.

Creating Staves excerpt
If desired, a spell can be placed into the staff at less than the normal cost, but then activating that particular spell drains additional charges from the staff. Divide the cost of the spell by the number of charges it consumes to determine its final price. Note that this does not change the order in which the spells are priced (the highest level spell is still priced first, even if it requires more than one charge to activate). The caster level of all spells in a staff must be the same, and no staff can have a caster level of less than 8th, even if all the spells in the staff are low-level spells.