maxBounds freezes map in 0.6.3

Setting the maxBounds of a map (through map options or the setMaxBounds function) works perfectly in IE8. But after calling invalidateSize, panning to outside the max bounds causes an "Out of stack space" exception in IE8.

Demo: http://dl.dropboxusercontent.com/u/67198349/leaflet/IE8MaxBoundsInvalidateSizeIssue.htm (Click the Full Screen link at the buttom to trigger invalidateSize())
