huge number crash
The combination of small values in stroke-dasharray and a large pathLength
crashes/freezes Opera9 (tested with build 434).
Of course, this example is not very useful, similar crashes occured with much more
complex dynamic generated files using PHP - calculating the huge trajectory of
chaotic attraktors - numeric solutions of differential equations. Because the
attractor is chaotic and sometimes divergent, the trajectory can get very long,
if stroke-dasharray is animated to get the visible effect of the real-time
painting of the trajectory pathLength is used. This crash situation may occur if
authors test their number-cruncher scripts, hopefully not in tested applications
anymore.
In general if an author tries to animate trajectories or tries to display approximations
of fractal curves or something like this (with a fractal dimension larger than 1),
the pathLength can become very long in a finite area of a SVG document.