Text width measured inconsistently between Legacy and Next on native target

Main.hx

package;


import openfl.display.Sprite;
import openfl.text.Font;
import openfl.text.TextField;
import openfl.text.TextFieldAutoSize;
import openfl.text.TextFormat;

import openfl.Lib;

class Main extends Sprite {
	
	private var _log:TextField;
	
	public function new () {
		
		super ();
		
		var format = new TextFormat ("Katamotz Ikasi", 60, 0x7A0026);
		var textField = new TextField ();
		
		textField.defaultTextFormat = format;
		textField.embedFonts = true;
		textField.selectable = false;
		
		textField.y = 50;
		textField.autoSize = TextFieldAutoSize.LEFT;
		
		textField.text = "Hello World";
		
		addChild (textField);

		// On Flash Legacy and Next, 281.45
		// On Mac Legacy, traces 285
		// On Mac Next, traces 280.71875
		doTrace(textField.width);

		// On Flash Legacy and Next, it's placed consistently and looks exactly the same. 
		// On Mac Legacy, nicely hugs the right side of the app window
		// On Mac Next, compared to Legacy, the right edge is just off screen
		// On Mac Legacy and Next, it appears slightly larger than on Flash. 
		textField.x = Lib.current.stage.stageWidth - textField.width;

		var textFieldWithTrailingSpace = new TextField();

		textFieldWithTrailingSpace.defaultTextFormat = format;
		textFieldWithTrailingSpace.embedFonts = true;
		textFieldWithTrailingSpace.selectable = false;
		
		textFieldWithTrailingSpace.y = 250;
		textFieldWithTrailingSpace.autoSize = TextFieldAutoSize.LEFT;

		textFieldWithTrailingSpace.text = "Space after this        ";

		addChild(textFieldWithTrailingSpace);

		// On Flash Legacy and Next, traces 579.35
		// On Mac Legacy, traces 580
		// On Next, traces 386.03125
		doTrace(textFieldWithTrailingSpace.width);

		// On Flash Legacy and Next, this is approximately in the center of the window due to the spaces
		// On Mac Legacy, it's approximately in the center of the window as well. 
		// On Mac Next, it's all the way to the right, as if there were no spaces. 
		textFieldWithTrailingSpace.x = Lib.current.stage.stageWidth - textFieldWithTrailingSpace.width;

		
		// Links to screenshots: 
		// Flash Legacy	https://dl.dropboxusercontent.com/u/7139766/The%20Mission/text%20width%20bug/Flash%20Legacy.png
		// Flash Next	https://dl.dropboxusercontent.com/u/7139766/The%20Mission/text%20width%20bug/Flash%20Next.png
		// Mac Legacy	https://dl.dropboxusercontent.com/u/7139766/The%20Mission/text%20width%20bug/Mac%20Legacy.png
		// Mac Next	https://dl.dropboxusercontent.com/u/7139766/The%20Mission/text%20width%20bug/Mac%20Next.png
	}
	
	private function doTrace(message:Dynamic):Void {

		if (_log == null) {
			_log = new TextField();
			addChild(_log);
		}

		_log.text += message.toString() + "\n";
	}
}

Flash Legacy

Flash Next

Mac Legacy

Mac Next