s2/cellid.go (1 line):
	- line 495: // TODO: the methods below are not exported yet.  Settle on the entire API design


s2/shapeindex.go (1 line):
	- line 453: // TODO: the edge crosser may need an in-place Init method if this gets expensive


s2/cap.go (1 line):
	- line 480: // TODO: This calculation would be more efficient using s1.ChordAngles.