Errors timer callback does not promptly peg the failure statistic and also leaves non-zero backlog

In Cheshire Cat the following function has a syntax error in the timer callback (I have a source bucket with 10M docs and only make about 19.5K timers) oddly the code editor is showing the error count promptly at the problematic line - but the main statistic doesn't show the count for minutes - yet my timer fires as soon as possible!

function TimerCallback(context) {

 // intentional error pegging as a failure is too slow

 e = 10;

 // correct syntax

 // var e = 10;

}

function OnUpdate(doc, meta) {

 // only process 1/512 or 2 vBuckets 0.19% of 10M or 19.5 k timers  

 if (meta.vb && ((meta.vb % 512) !== 0)) return; 

 // intentional error pegging as a failure is too slow

 // e = 10;

 // correct syntax

 // var e = 10;

 createTimer(TimerCallback, new Date(), meta.id, {id: meta.id, doc: doc}); 

}

If the syntax error is as shown in the code block above my failure: statistic across 10M incorrectly stays at 0 - but I can View the code and hover over the "caution" symbol where the failure occurs and se he count incrementing each time I open the code editor. 

However if I wait a few more minutes the failure: statistic will correctly display 19572 - this is delayed by too much as the timer was firing from now, i.e. new Date().  I would expect a 7-14 second delay not several minutes for the failure: statistic to peg.  We really want more prompt feedback that something is failing.

If the syntax error is in the OnUpdate block it works as expected  uncomment "e = 10;" and my failure: statistic across 10M rows is about 0.19% of the bucket or ~ 19572.  However I do end up with a "backlog" of 3066 when the backlog should be 0.