Property definitions

geometry $ Point3d :: defaultinit
# 3D point with `x`, `y` and `z`
class Point3d[N: Numeric]
	super IPoint3d[N]
	super Point[N]

	redef var z: N = 0.0 is writable, optional
end
lib/geometry/points_and_lines.nit:158,1--164,3