Overflow is capped at the cost of the thing being produced IIRC.
Firaxis vexed me greatly by introducing a bug in overflow in 3.19 and never, ever fixing it. Overflow beyond the cap used to be converted into
, but 3.17 and before it would keep the
multipliers from traits, resources, etc and convert that amount into gold. Apparently Firaxis intended to still allow overflow but not the multiplier bonus...however like in the vast majority of cases with Firaxis the coding was pretty
incompetent (considering unofficial 3.17 patch had it working the way 3.19 was intended to work, and wasn't even done on a payroll!) and the "patch" simply removed overflow entirely.
The net result of this was a massive nerf to the protective trait.
Read that again. Firaxis nerfed protective. Seriously. Nothing proved to me that Firaxis was out of touch like them allowing things like "unit moving before you can give it orders" and "control hotkeys don't work" in a release title to remain in EVERY SINGLE PATCH while going OUT OF THEIR WAY to NERF the WEAKEST trait on purpose...and on top of this DOUBLE FAILING by introducing a BUG!
To this day, it is possible to control click a group of units, and not have that unit type selected. To shift click on a stack and watch nothing happen at all. To have intended features like waypoints unusable in competitive settings because there's no basic interruption algorithm for the pathing (seriously? That's stuff that games did in the 1990's too). To DECLARE WAR when simply trying to open a trade screen.
Firaxis response to known issues with controls, a broken VC (AP), borked vassal state mechanics, etc? INTRODUCE A BUG WHILE TRYING TO NERF THE WEAKEST TRAIT!
Derp derp derp derp.