Question: discont=true isn't always working

I'm plotting some simple plots such as

plot(frac(x^2/3)*3,x=-5..5, discont=true);


Some discontinuities are connected. Using numpoints, resolution, and Digits doesn't help. Sometimes it will produce a plot with no connections but then other times it does. I need a general solution that is simple. Is there any way to refine the quality of discont?




I have tried that and it seems to work but I haven't put it through the ringer. Is that all I have?


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