Fluid rounding incorrect

Alternate title - the evils of units that are not what they seem…

Game setting - Recipe Parts Multiplier 0.5

Refinery with HOR alt recipe: In game, the 30 input oil become 15. The modeler displays 20.

The cause seems to be that the config files for modeler handle fluids with an implicit multiplier of 1000. The game also handles fluid quantities as multiples of 1000 - but divides by 100 for UI display. So, naturally, the config files say the input is “-3” meaning -3,000 oil. That’s OK so far.

The issue relates to the fact that the game calculates the ½ price recipe parts as 3×1000×0.5 yielding a display of 15 (but handled internally as 1500). The problem is that the modeler seems to be doing (3×0.5)*1000 with rounding on the first sub-calculation.