id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11121	Invalid result of difference() for integral coordinates.	awulkiew	Barend Gehrels	"For polygons:

{{{
green = ""POLYGON((-8042 -1485,-8042 250,-8042 250,15943 254,15943 -1485,-8042 -1485))"",
blue = ""POLYGON((-7901 -1485,-7901 529,-7901 529, 15802 544, 15802 -1485, -7901 -1485))""
}}}

The result of difference(green, blue) and/or difference(blue, green) is invalid if the polygons use `int` coordinate type.

I think it may be related to get_turns/cart_intersect and ratios/fractions but it needs further investigation. I noticed that turns has wrong coordinates, always endpoints of segments are picked as if internally ratios were always truncated to 0."	Bugs	closed	Boost 1.58.0	geometry	Boost Development Trunk	Problem	fixed	difference, integral, setops, get_turns	mkaravel