clusters disappear when setting illegal zoom

Demo link or sample code:
[http://fiddle.jshell.net/doktormolle/wCWdn/show/]

What steps will reproduce the problem?
1.zoom the map to the mininum possible zoom-value
2.use setZoom() to set the zoom to a lower(illegal) value than possible minZoom 

Expected result:
[map zooms to minZoom and markers will be clustered depending on the minZoom]

Actual result:
[map zooms to minZoom and clusters disappear]

Browser / Operating System:
[e.g. Opera12.12,FF19,Chrome25 / WinXP]

Additional comments:
[the Maps-API returns a wrong zoom-level when setting the zoom to an illegal 
value, what appears to be the problem here. Possible fix: 
http://stackoverflow.com/a/15102263/459897]

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Original issue reported on code.google.com by sven.min...@gmail.com on 27 Feb 2013 at 1:31

map2701 / google-maps-utility-library-v3

clusters disappear when setting illegal zoom #231