Improve output: distinguish between failed assertions (failures) and unexpected exceptions (errors), and print a filtered stack trace for any exception.

webapp/src/org/json/JSONString.java

@@ -0,0 +1,18 @@
+package org.json;
+/**
+ * The <code>JSONString</code> interface allows a <code>toJSONString()</code> 
+ * method so that a class can change the behavior of 
+ * <code>JSONObject.toString()</code>, <code>JSONArray.toString()</code>,
+ * and <code>JSONWriter.value(</code>Object<code>)</code>. The 
+ * <code>toJSONString</code> method will be used instead of the default behavior 
+ * of using the Object's <code>toString()</code> method and quoting the result.
+ */
+public interface JSONString {
+	/**
+	 * The <code>toJSONString</code> method allows a class to produce its own JSON 
+	 * serialization. 
+	 * 
+	 * @return A strictly syntactically correct JSON text.
+	 */
+	public String toJSONString();
+}