Modding Help "fixedLevel" : false

What does this tag on shields do exactly? I'm trying to make some tiered shields, I saw the named vanilla shields have this tag. Should I use it, or stick to the "level" : # tag?

 

from /items/buildscripts/buildshield.lua (and any other buildscript it seems

Code:

function build(directory, config, parameters, level, seed)
  [...]
  if level and not configParameter("fixedLevel", false) then
  parameters.level = level
  end

I believe the build() function's level and seed parameters are generated regarding the planet's threat type and randomly respectively, so if the shield config sets "fixedLevel" to true or if there's no level parameter, then it'll use that level over the build()'s level

 

so if I set it to false, when the item is crafted, the level would vary depending on the planet? Or does it only work on looted stuff?

 

The level would vary depending on whatever builds the weapon, I don't exactly know how it's done depending on context but I'd expect the planet's threatLevel being the main source