• Added the -smooth command for scale-aware smoothing of polygon and polyline features, using a Gaussian (Savitzky–Golay) low-pass filter. The <distance> parameter sets the resolution of the result (detail finer than this is removed; larger features are preserved). Options include keep-corners (preserve sharp corners where straight-line segments meet), gain= (strength of the curvature-shrinkage correction; 0 disables it, >1 exaggerates bends), no-prefilter (skip the default detail-removal preprocessing step), and planar.