Constant MAX_DESIGN_POINTS 

pub const MAX_DESIGN_POINTS: usize = _; // 1_048_576usize

The most points a design lays out: 1,048,576, far more than flights can be flown for. With MAX_DESIGN_VALUES it keeps a design’s points under about 200 MiB (a point costs its coordinates, 8 bytes each, and a list of them, about 40 bytes).