diff --git a/cgi.d b/cgi.d
index 3251f7a..fed327a 100644
--- a/cgi.d
+++ b/cgi.d
@@ -6028,7 +6028,7 @@ version(cgi_with_websocket) {
 				if(d.length < 8) return needsMoreData();
 
 				foreach(i; 0 .. 8) {
-					msg.realLength |= d[0] << ((7-i) * 8);
+					msg.realLength |= ulong(d[0]) << ((7-i) * 8);
 					d = d[1 .. $];
 				}
 			} else {
diff --git a/dom.d b/dom.d
index be68e7f..676c0a8 100644
--- a/dom.d
+++ b/dom.d
@@ -1239,6 +1239,7 @@ class Document : FileResource, DomParent {
 		return e;
 	}
 
+	/// ditto
 	final MaybeNullElement!SomeElementType optionSelector(SomeElementType = Element)(string selector, string file = __FILE__, size_t line = __LINE__)
 		if(is(SomeElementType : Element))
 	{
@@ -2306,6 +2307,12 @@ class Element : DomParent {
 
 		Note: you can give multiple selectors, separated by commas.
 	 	It will return the first match it finds.
+
+		Tip: to use namespaces, escape the colon in the name:
+
+		---
+			element.querySelector(`ns\:tag`); // the backticks are raw strings then the backslash is interpreted by querySelector
+		---
 	+/
 	@scriptable
 	Element querySelector(string selector) {
diff --git a/game.d b/game.d
index 75fcf2a..afcdbf2 100644
--- a/game.d
+++ b/game.d
@@ -1,3 +1,4 @@
+// i could add a "time" uniform for the shaders automatically. unity does a float4 i think with ticks in it
 // register cheat code? or even a fighting game combo..
 /++
 	An add-on for simpledisplay.d, joystick.d, and simpleaudio.d
diff --git a/joystick.d b/joystick.d
index 9fea479..f73f1bb 100644
--- a/joystick.d
+++ b/joystick.d
@@ -4,7 +4,9 @@
 
 	Pass `-version=ps1_style` or `-version=xbox_style` to pick your API style - the constants will use the names of the buttons on those controllers and attempt to emulate the other. ps1_style is compatible with more hardware and thus the default. XBox controllers work with either, though.
 
-	The docs for this file are quite weak, I suggest you view source of [arsd.gamehelers] for an example of how it might be used.
+	The docs for this file are quite weak, I suggest you view source of [arsd.game] for an example of how it might be used.
+
+	FIXME: on Linux, certain controller brands will not be recognized and you need to set the mappings yourself, e.g., `version(linux) joystickMapping[0] = &xbox360Mapping;`. I will formalize this into a proper api later.
 +/
 
 /*
diff --git a/simpledisplay.d b/simpledisplay.d
index 0540ab9..ae95df3 100644
--- a/simpledisplay.d
+++ b/simpledisplay.d
@@ -8486,6 +8486,11 @@ struct ScreenPainter {
 
 	/++
 		start and finish are units of degrees * 64
+
+		History:
+			The Windows implementation didn't match the Linux implementation until September 24, 2021.
+
+			They still don't exactly match in outlining the arc with straight lines (Windows does, Linux doesn't for now).
 	+/
 	void drawArc(Point upperLeft, int width, int height, int start, int finish) {
 		if(impl is null) return;
@@ -10205,10 +10210,10 @@ version(Windows) {
 				float startAngle = cast(float) start / 64.0 / 180.0 * 3.14159265358979323;
 				float endAngle = cast(float) finish / 64.0 / 180.0 * 3.14159265358979323;
 
-				auto c1 = cast(int)(cos(startAngle) * width / 2 + x1 + width / 2);
-				auto c2 = cast(int)(-sin(startAngle) * height / 2 + y1 + height / 2);
-				auto c3 = cast(int)(cos(endAngle) * width / 2 + x1 + width / 2);
-				auto c4 = cast(int)(-sin(endAngle) * height / 2 + y1 + height / 2);
+				auto c1 = cast(int) roundf(cos(startAngle) * width / 2 + x1 + width / 2);
+				auto c2 = cast(int) roundf(-sin(startAngle) * height / 2 + y1 + height / 2);
+				auto c3 = cast(int) roundf(cos(endAngle) * width / 2 + x1 + width / 2);
+				auto c4 = cast(int) roundf(-sin(endAngle) * height / 2 + y1 + height / 2);
 
 				if(_activePen.color.a)
 					Arc(hdc, x1, y1, x1 + width + 1, y1 + height + 1, c1, c2, c3, c4);
diff --git a/terminalemulator.d b/terminalemulator.d
index 33b6f6e..abb2e3a 100644
--- a/terminalemulator.d
+++ b/terminalemulator.d
@@ -27,6 +27,13 @@
 */
 module arsd.terminalemulator;
 
+/+
+	FIXME
+	terminal optimization:
+        first invalidated + last invalidated to slice the array
+        when looking for things that need redrawing.
++/
+
 import arsd.color;
 import std.algorithm : max;