Function global_fluid 

const fn global_fluid(
    y: i32,
    lava_floor: i32,
    sea_level: i32,
    lava_id: BlockStateId,
    default_fluid_id: BlockStateId,
) -> FluidStatus

Global fluid picker matching vanilla’s NoiseBasedChunkGenerator.createFluidPicker.

Below min(-54, sea_level) → lava at Y=-54. Otherwise → the dimension’s default fluid at sea level (water for overworld, lava for nether).