fix for issue mikechambers#184 from original fork.

Author: sangupta

src/com/adobe/serialization/json/JSONEncoder.as

@@ -164,17 +164,18 @@ package com.adobe.serialization.json
 					default: // everything else
 
 						// check for a control character and escape as unicode
-						if ( ch < ' ' )
-						{
+						if ( ch < ' '  || ch > '}' ) {
 							// get the hex digit(s) of the character (either 1 or 2 digits)
 							var hexCode:String = ch.charCodeAt( 0 ).toString( 16 );
 
 							// ensure that there are 4 digits by adjusting
 							// the # of zeros accordingly.
-							var zeroPad:String = hexCode.length == 2 ? "00" : "000";
+							while( hexCode.length < 4 ) {
+								hexCode = "0" + hexCode;
+							}
 
 							// create the unicode escape sequence with 4 hex digits
-							s += "\\u" + zeroPad + hexCode;
+							s += "\\u" + hexCode;
 						}
 						else
 						{