path.clone() doesn't have the right return type in TypeScript

[sasensi]

Description/Steps to reproduce

import * as paper from 'paper';

let path = new paper.Path();
path = path.clone();

The last assignment produces an error because path.clone() return type is Item and not Path as it should be.

Expected result

This code should not produce any error.

Workaround

import * as paper from 'paper';

let path = new paper.Path();
path = path.clone() as paper.Path;