in packages/util-shapes/src/Rectangle.ts [11:17]
public constructor(
public x: Xform<SGRectItem, number> = d => d.x || 0,
public y: Xform<SGRectItem, number> = d => d.y || 0,
public width: Xform<SGRectItem, number> = d => d.width || 0,
public height: Xform<SGRectItem, number> = d => d.height || 0,
public cornerRadius: Xform<SGRectItem, number> = d => d.cornerRadius || 0,
) {}