Math.atan2(Infinity, Infinity) produces wrong result

[alawatthe]

The following function calls all produce NaN:

Math.atan2(Infinity, Infinity)
Math.atan2(Infinity, -Infinity)
Math.atan2(-Infinity, Infinity)
Math.atan2(-Infinity, -Infinity)

But they should give the results
+π/4
+3π/4
−π/4
−3π/4

See for example: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-math.atan2

The about:version information:
Command line C:\Program Files\Midori\bin\midori.exe
Midori 0.5.8 ((null)) Midori.exe
GTK+ 3.6.4 (3.6.4) Glib 2.34.3 (2.34.3)
WebKitGTK+ 1.10.2 (1.10.2) libSoup 2.40.3
cairo 1.12.10 (1.12.10) libnotify No
gcr No granite No
Platform Windows NT 6.2
Identification Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.6 (KHTML, like Gecko) Chrome/18.0.1025.133 Safari/537.6 Midori/0.5
Video Formats H264 [x] Ogg Theora [x] WebM [x]

[gue5t gue5t (gue5t)]

Generally you would want to report this upstream to the WebkitGTK+ developers (at webkitgtk.org), but I believe this is fixed in later versions of webkit; I see the non-NaN answers you list with WebkitGTK+ 2.4.6.

I'm not sure what the status is w/r/t distributing a Windows build with a more recent version of webkit.