pub const PLACEMENT_EPSILONS: Scalar = 4.0;Expand description
How many f64::EPSILON of the largest summed coordinate magnitude
bound the rounding of applying a transform to a point (#295): a
coordinate sums four terms, each rounded at most four times, so it is
off by at most gamma_4 < 2.000_001 eps of its summed magnitude, and a
point by sqrt 3 of that, below 3.47 eps; 4 also covers computing
the magnitude itself in f64 (see the module’s “Placement rounding”).