Possible robofab bug?

gistfile1.py

'''
My understanding is that TrueType and OpenType external contours should be clockwise; 
internal contours should be counter-clockwise.

RGlyph.correctDirection(), however, seems to normalize contours in exactly the opposite manner.

This script reproduces the issue, drawing a simple square.
'''

import os
import robofab.world

font = robofab.world.NewFont(familyName='test', styleName='test')
font.info.ascender = 1000
font.info.descender = 300
font.info.unitsPerEm = 2024
font.info.xHeight = 500
font.info.capHeight = 1000

glyph = font.newGlyph('A')
glyph.unicode = ord('A')
glyph.width = 1000

# Draw a square.
glyphPen = glyph.getPen()
glyphPen.moveTo((0, 0,))
glyphPen.lineTo((0, 1000,))
glyphPen.lineTo((1000, 1000,))
glyphPen.lineTo((1000, 0,))
glyphPen.closePath()

# The key line
glyph.correctDirection()

glyph.update()

font.update()

dstFile = 'test.ufo'
font.save(dstFile)

font.close()