diff --git a/color.d b/color.d
index 74558d7..2d3d270 100644
--- a/color.d
+++ b/color.d
@@ -1577,6 +1577,8 @@ struct Rectangle {
 	Implements a flood fill algorithm, like the bucket tool in
 	MS Paint.
 
+	Note it assumes `what.length == width*height`.
+
 	Params:
 		what = the canvas to work with, arranged as top to bottom, left to right elements
 		width = the width of the canvas
@@ -1585,13 +1587,17 @@ struct Rectangle {
 		replacement = the replacement value
 		x = the x-coordinate to start the fill (think of where the user clicked in Paint)
 		y = the y-coordinate to start the fill
-		additionalCheck = A custom additional check to perform on each square before continuing. Returning true means keep flooding, returning false means stop.
+		additionalCheck = A custom additional check to perform on each square before continuing. Returning true means keep flooding, returning false means stop. If null, it is not used.
 +/
 void floodFill(T)(
 	T[] what, int width, int height, // the canvas to inspect
 	T target, T replacement, // fill params
 	int x, int y, bool delegate(int x, int y) @safe additionalCheck) // the node
+
+	// in(what.length == width * height) // gdc doesn't support this syntax yet so not gonna use it until that comes out.
 {
+	assert(what.length == width * height); // will use the contract above when gdc supports it
+
 	T node = what[y * width + x];
 
 	if(target == replacement) return;
@@ -1604,6 +1610,44 @@ void floodFill(T)(
 	if(!additionalCheck(x, y))
 		return;
 
+	Point[] queue;
+
+	queue ~= Point(x, y);
+
+	while(queue.length) {
+		auto n = queue[0];
+		queue = queue[1 .. $];
+		//queue.assumeSafeAppend(); // lol @safe breakage
+
+		auto w = n;
+		int offset = cast(int) (n.y * width + n.x);
+		auto e = n;
+		auto eoffset = offset;
+		w.x--;
+		offset--;
+		while(w.x >= 0 && what[offset] == target && additionalCheck(w.x, w.y)) {
+			w.x--;
+			offset--;
+		}
+		while(e.x < width && what[eoffset] == target && additionalCheck(e.x, e.y)) {
+			e.x++;
+			eoffset++;
+		}
+
+		// to make it inclusive again
+		w.x++;
+		offset++;
+		foreach(o ; offset .. eoffset) {
+			what[o] = replacement;
+			if(w.y && what[o - width] == target && additionalCheck(w.x, w.y))
+				queue ~= Point(w.x, w.y - 1);
+			if(w.y + 1 < height && what[o + width] == target && additionalCheck(w.x, w.y))
+				queue ~= Point(w.x, w.y + 1);
+			w.x++;
+		}
+	}
+
+	/+
 	what[y * width + x] = replacement;
 
 	if(x)
@@ -1621,6 +1665,7 @@ void floodFill(T)(
 	if(y != height - 1)
 		floodFill(what, width, height, target, replacement,
 			x, y + 1, additionalCheck);
+	+/
 }
 
 // for scripting, so you can tag it without strictly needing to import arsd.jsvar
diff --git a/gamehelpers.d b/gamehelpers.d
index f041d07..0295259 100644
--- a/gamehelpers.d
+++ b/gamehelpers.d
@@ -394,6 +394,7 @@ final class OpenGlTexture {
 
 	/// After you delete it with dispose, you may rebind it to something else with this.
 	void bindFrom(TrueColorImage from) {
+		assert(from !is null);
 		assert(from.width > 0 && from.height > 0);
 
 		import core.stdc.stdlib;
diff --git a/jsvar.d b/jsvar.d
index 7a027a2..8abef87 100644
--- a/jsvar.d
+++ b/jsvar.d
@@ -549,6 +549,7 @@ struct var {
 		}
 	}
 
+	/// `if(some_var)` will call this and give behavior based on the dynamic type. Shouldn't be too surprising.
 	public bool opCast(T:bool)() {
 		final switch(this._type) {
 			case Type.Object:
@@ -568,6 +569,7 @@ struct var {
 		}
 	}
 
+	/// You can foreach over a var.
 	public int opApply(scope int delegate(ref var) dg) {
 		foreach(i, item; this)
 			if(auto result = dg(item))
@@ -575,6 +577,7 @@ struct var {
 		return 0;
 	}
 
+	/// ditto
 	public int opApply(scope int delegate(var, ref var) dg) {
 		if(this.payloadType() == Type.Array) {
 			foreach(i, ref v; this._payload._array)
@@ -606,15 +609,30 @@ struct var {
 	}
 
 
+	/// Alias for [get]. e.g. `string s = cast(string) v;`
 	public T opCast(T)() {
 		return this.get!T;
 	}
 
+	/// Calls [get] for a type automatically. `int a; var b; b.putInto(a);` will auto-convert to `int`.
 	public auto ref putInto(T)(ref T t) {
 		return t = this.get!T;
 	}
 
-	// if it is var, we'll just blit it over
+	/++
+		Assigns a value to the var. It will do necessary implicit conversions
+		and wrapping.
+
+		You can make a method `toArsdJsvar` on your own objects to override this
+		default. It should return a [var].
+
+		History:
+			On April 20, 2020, I changed the default mode for class assignment
+			to [wrapNativeObject]. Previously it was [wrapOpaquely].
+
+			With the new [wrapNativeObject] behavior, you can mark methods
+			@[scriptable] to expose them to the script.
+	+/
 	public var opAssign(T)(T t) if(!is(T == var)) {
 		static if(__traits(compiles, this = t.toArsdJsvar())) {
 			static if(__traits(compiles, t is null)) {
@@ -661,7 +679,10 @@ struct var {
 			// so prewrapped stuff can be easily passed.
 			this._type = Type.Object;
 			this._payload._object = t;
-		} else static if(is(T == class) || .isScriptableOpaque!T) {
+		} else static if(is(T == class)) {
+			this._type = Type.Object;
+			this._payload._object = wrapNativeObject(t);
+		} else static if(.isScriptableOpaque!T) {
 			// auto-wrap other classes with reference semantics
 			this._type = Type.Object;
 			this._payload._object = wrapOpaquely(t);
@@ -846,6 +867,31 @@ struct var {
 		return null;
 	}
 
+	/++
+		Gets the var converted to type `T` as best it can. `T` may be constructed
+		from `T.fromJsVar`, or through type conversions (coercing as needed). If
+		`T` happens to be a struct, it will automatically introspect to convert
+		the var object member-by-member.
+
+		History:
+			On April 21, 2020, I changed the behavior of
+
+			---
+			var a = null;
+			string b = a.get!string;
+			---
+
+			Previously, `b == "null"`, which would print the word
+			when writeln'd. Now, `b is null`, which prints the empty string,
+			which is a bit less user-friendly, but more consistent with
+			converting to/from D strings in general.
+
+			If you are printing, you can check `a.get!string is null` and print
+			null at that point if you like.
+
+			I also wrote the first draft of this documentation at that time,
+			even though the function has been public since the beginning.
+	+/
 	public T get(T)() if(!is(T == void)) {
 		static if(is(T == var)) {
 			return this;
@@ -920,7 +966,7 @@ struct var {
 				} else static if(isSomeString!T) {
 					if(this._object !is null)
 						return this._object.toString();
-					return "null";
+					return null;// "null";
 				} else
 					return T.init;
 			case Type.Integral:
@@ -1126,18 +1172,22 @@ struct var {
 		return var(null);
 	}
 
+	/// Forwards to [opIndex]
 	public @property ref var opDispatch(string name, string file = __FILE__, size_t line = __LINE__)() {
 		return this[name];
 	}
 
+	/// Forwards to [opIndexAssign]
 	public @property ref var opDispatch(string name, string file = __FILE__, size_t line = __LINE__, T)(T r) {
 		return this.opIndexAssign!T(r, name);
 	}
 
+	/// Looks up a sub-property of the object
 	public ref var opIndex(var name, string file = __FILE__, size_t line = __LINE__) {
 		return opIndex(name.get!string, file, line);
 	}
 
+	/// Sets a sub-property of the object
 	public ref var opIndexAssign(T)(T t, var name, string file = __FILE__, size_t line = __LINE__) {
 		return opIndexAssign(t, name.get!string, file, line);
 	}
diff --git a/minigui.d b/minigui.d
index e977fd7..8846348 100644
--- a/minigui.d
+++ b/minigui.d
@@ -3150,7 +3150,7 @@ class TabWidget : Widget {
 	}
 
 	override int marginTop() { return 4; }
-	override int marginBottom() { return 4; }
+	override int paddingBottom() { return 4; }
 
 	override int minHeight() {
 		int max = 0;
diff --git a/simpledisplay.d b/simpledisplay.d
index 1630fde..1c9584e 100644
--- a/simpledisplay.d
+++ b/simpledisplay.d
@@ -13459,6 +13459,8 @@ extern(System) nothrow @nogc {
 		uint/*GLenum*/ format, uint/*GLenum*/ type, in void* pixels);
 	void glTexEnvf(uint/*GLenum*/ target, uint/*GLenum*/ pname, float param);
 
+	void glLineWidth(int);
+
 
 	void glTexCoord2f(float, float);
 	void glVertex2i(int, int);
diff --git a/ttf.d b/ttf.d
index 4345b93..cf0b4cc 100644
--- a/ttf.d
+++ b/ttf.d
@@ -16,6 +16,8 @@ module arsd.ttf;
 
 // here's some D convenience functions
 
+// need to do some print glyphs t it....
+
 
 ///
 struct TtfFont {