MarkerClusterer imagePath contains 1.png (maybe a test output left over in the production build?)

[Defcon0]

Hello,

I use the following code to set my own clusterer image:

$clusterer->setOption('imagePath', $imagePath);

Basically it works as intended. But in the generated JavaScript, there's the string "1.png" appended to the path which is not in my path at all. It seems to be some test string ;-)

Is it a bug?