mdm.Application.Trial.daysLeft should return NaN in non trial-enabled application.
When api returns NaN from mdm.Application.Trial.daysLeft developers expect that application current trial protection state is either undefined (no trial protection api/feature was ever used) or trial protection was just removed (there is no other dedicated property to indicate that state except of checking for NaN value).

Below code should always return NaN (and yields PASSED) once compiled to native application but without any trial protection option used:

import mdm.*;
//
function initApp():void
{
// #1 in non-protected application we should get NaN (no trial was used at all or trial was lifted)
var numOfDaysLeft:Number = mdm.Application.Trial.daysLeft;
// #2 check for NaN = for not protected applications that should be always NaN
var msg:String = "numOfDaysLeft = "+numOfDaysLeft+" ("+(isNaN(numOfDaysLeft) ? "PASSED" : "FAIL")+")";
debug(msg);
};
//
var tf:TextField = null;
function debug(msg:*):void
{
if(!tf)
{
tf = new TextField();
tf.autoSize = "left";
tf.x = tf.y = 20;
addChild(tf);
};
tf.text = msg.toString();
};
//
mdm.Application.init(this, initApp);


To repeat:
#1
compile provide flash source/ZINC project
#2
run resulting executable

Expected output:

numOfDaysLeft = NaN (PASSED)

Actual output:

numOfDaysLeft = 0 (FAIL)