So while writing some stuff for a mod, I copied some field data from \data\base\prototypes\entity\turrets.lua and absent-mindely forgot about it until five minutes later when my lua linter was yelling at me about a variable's value being unused. Which was really weird, because I hadn't done anything in the file but tweak some values elsewhere.
Turns out, the issue came from the base prototype and the linter was being a bit obtuse: by a value not being used, it meant that it was being overridden. prepare_range is defined twice in the same prototype table, each time with different values.
(this is inside medium-worm-turret, on turrets.lua)
This counts as a bug because the value that the game processes for data.raw.turret["medium-worm-turret"].prepare_range is 30, not 25, which may be unintended behaviour.
Just for curiosity I ran my linter, luacheck, to find more cases of this happening inside the prototype bases, and it found a few. I haven't looked at them yet personally, excluding the ones in turrets.lua*, the following report indicates the file and line number.
* The other times it happens in the turrets.lua file both instantiations have the same value, so it's not a bug but it's still kinda dirtied code.
Luacheck report for error code 314
